A2 Verb Moods 12 min read Easy

Must vs. Have to: Talking about Necessity

Must is *you* deciding; have to is *the world* deciding. Know the difference!
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Grammar Rule in 30 Seconds

Use 'must' for personal feelings of necessity and 'have to' for outside rules or facts.

  • Use 'must' for internal obligation: 'I must study harder.'
  • Use 'have to' for external rules: 'I have to wear a uniform at work.'
  • Negative 'mustn't' means 'don't do it', but 'don't have to' means 'it's optional'.
👤 + must/have to + 🏃 (Base Verb)

Overview

Use 'must' and 'have to' for things you need to do.

Use 'must' for your ideas. Use 'have to' for rules.

How This Grammar Works

Use 'must' when you think something is very important.
For example, “I must finish this report today” implies a personal drive, perhaps due to your own work ethic.
Use 'have to' for rules from your boss or school.
You do it because a rule says you need to.
'Have to' is for school, work, or law rules.
'Must' sounds very strong. It shows your own strong opinion.

Formation Pattern

1
Put a simple action word after 'must' or 'have to'.
2
Positive Statements:
3
I must go. You must eat. He must stay.
4
'Must' never changes. Do not add '-s' or '-ed' to it.
5
Example: “You must remember my birthday.” “She must submit her application.”
6
I have to go. You have to eat.
7
Use 'has to' for he, she, and it.
8
How to use 'have to' correctly:
9
| Subject | Form | Example |
10
| :-------------- | :--------- | :------------------------------------ |
11
| I | have to | I have to wake up early tomorrow. |
12
| You | have to | You have to wear a uniform at work. |
13
| He/She/It | has to | He has to complete the training. |
14
| We | have to | We have to attend the meeting. |
15
| They | have to | They have to get new passports. |
16
Negative Statements:
17
'Must not' and 'don't have to' mean very different things.
18
'Must not' means do not do it. It is against rules.
19
Example: “You must not smoke in the hospital.” “We mustn’t forget to call Grandma.”
20
'Don't have to' means you can choose. It is not required.
21
Example: “You don’t have to pay for parking on Sundays.” “She doesn’t have to work late tonight.”
22
Questions:
23
Can I use 'must' in a question?
24
People do not often use 'must' for questions.
25
Example: “Must I wait here?” (Very formal).
26
Use 'do' or 'does' to ask questions with 'have to'.
27
Ask 'Do you have to...?' to learn the rules.
28
Questions with 'have to':
29
Do you have to go? Does she have to stay?
30
| :-------- | :------------ | :-------- | :---------------------------------------- |
31
| Do | I/you/we/they | have to | Do you have to work on Sundays? |
32
| Does | he/she/it | have to | Does he have to wear a uniform? |
33
Past Tense:
34
'Must' has no past. Do not say 'musted'.
35
Always use had to for any past necessity, internal or external.
36
Example: “I had to leave early yesterday.” “We had to study for the test.”
37
Use 'didn't have to' for the past.
38
Example: “We didn’t have to bring lunch; it was provided.” “She didn’t have to work overtime last week.”
39
Future Tense:
40
You can use 'must' for things happening later.
41
Example: “I must remember to send that email tomorrow.”
42
Use 'will have to' for things you need to do later.
43
Example: “You will have to apply for a visa.” “I will have to work late next week.”

When To Use It

Pick 'must' or 'have to' based on why you do it.
Use Must when:
  • Expressing Strong Personal Obligation or Conviction: The necessity arises from your own feelings, beliefs, or a deep sense of duty. This implies emotional investment.
  • Example: “I must call my parents tonight; I haven't spoken to them all week.” “We must do better to protect our environment.”
  • Giving Strong Recommendations or Advice: You want to convey that something is highly recommended or an essential experience from your perspective. It reflects personal enthusiasm.
  • Example: “You must visit the Grand Canyon when you're in Arizona!” “Everyone must read this book; it's life-changing.”
  • Impersonal Rules (Formal, Written Contexts): In very formal written contexts (official documents, signs), must can indicate an impersonal rule due to conciseness. Have to is more common in everyday speech.
  • Example: “All visitors must report to reception.”
  • Logical Deduction (Advanced A2/B1): To express a strong belief that something is true, based on available evidence. This implies high certainty about a fact, not an obligation.
  • Example: “The ground is wet; it must have rained last night.” “She's always studying; she must be very smart.”
Use Have to when:
  • Referring to External Rules, Laws, or Regulations: The obligation is imposed by an outside authority, system, or societal expectation. This is the most common use.
  • Example: “You have to wear a seatbelt when you drive.” “Students have to be at school by 8 AM.”
  • Reporting Instructions, Orders, or Duties: Someone else has instructed you, or it is part of your job, role, or an agreement.
  • Example: “My doctor said I have to take this medicine twice a day.” “I have to work on Saturdays as part of my job contract.”
  • Describing Circumstantial Necessity: External circumstances make an action unavoidable, regardless of your personal feelings.
  • Example: “My car broke down, so I have to take the bus.” “It’s raining, so we have to stay inside.”
  • Asking About Obligations: In nearly all questions about necessity, have to is the natural and common choice, avoiding the formality of must.
  • Example: “Do I have to bring my ID?” “What time do we have to leave tomorrow?”

Common Mistakes

Many students make mistakes. Read this to speak better.
  1. 1Confusing mustn't and don't have to: This is the most critical error, leading to significant miscommunication.
  • Mustn't = Prohibition (DO NOT DO IT): Means something is absolutely forbidden or against rules, likely with a penalty. Example: “You mustn’t park here.”
  • Don't have to = Lack of Necessity (NOT REQUIRED, OPTIONAL): Means something is not obligatory; you are free to do it. Example: “You don’t have to pay for entry.”
  • Misusing these can sound authoritarian or create unintended meanings. "You mustn't worry" forbids worry, whereas "You don't have to worry" offers reassurance.
  1. 1Using must for past obligations: English has no direct past tense for must when expressing obligation.
  • Incorrect: “Yesterday, I must go to the dentist.”
  • Correct: “Yesterday, I had to go to the dentist.”
  • Always use had to for any past necessity, internal or external.
  1. 1Omitting do/does with have to in questions and negatives: Have to functions as a regular verb phrase, requiring do (or does/did) for questions and negative statements in simple tenses.
  • Incorrect: “Has he to leave soon?” “She not have to attend.”
  • Correct: “Does he have to leave soon?” “She doesn’t have to attend.”
  • This is common because learners mistakenly treat have to as a modal verb like must.
  1. 1Overusing must in casual conversation: While grammatically correct, must often sounds formal, emphatic, or dramatic in everyday spoken English.
  • For general necessities, especially external ones, have to is much more common and natural in informal contexts.
  • Compare: “I must go now” (urgent, theatrical) versus “I have to go now” (neutral statement). In casual interactions, have to is generally preferred.
  1. 1Using must for impersonal external rules in spoken English: While must appears in formal written rules, using it conversationally to describe common, impersonal external rules can sound less natural than have to. For instance, "We must pay the rent by the fifth" is technically correct, but "We have to pay the rent by the fifth" is more typical as the obligation is externally imposed.

Real Conversations

Observing must and have to in authentic exchanges clarifies their nuanced usage. These examples demonstrate how native speakers apply the distinction in various modern scenarios.

S

Scenario 1

University Student Life

- Liam: “Ugh, I have to write another essay for history class. It’s due Friday.”

- Chloe: “Me too! I also have to study for my math exam. We must be crazy to take so many credits.”

- Liam: “Totally. But hey, you must try this new coffee shop downtown. Their espresso is amazing!”

- Chloe: “Oh, nice recommendation! But first, I must finish this chapter before I forget everything.”

- Analysis: Liam uses have to for an external academic deadline. Chloe uses have to for her exam and must to express a strong personal conviction (that they are crazy). Liam then uses must for a strong personal recommendation. Chloe uses must for a self-imposed immediate task.

S

Scenario 2

At the Airport

- Traveler 1: “Excuse me, do I have to take my shoes off at security?”

- Airport Staff: “Yes, you have to. It's a security regulation. And you must not carry liquids over 100ml in your hand luggage.”

- Traveler 2: “My flight's in an hour. I must hurry to the gate.”

- Traveler 1: “Oh, and do we have to fill out customs forms?”

- Airport Staff: “Only if you’re traveling internationally. For domestic flights, you don’t have to.”

- Analysis: Traveler 1 uses do...have to for an external rule. The staff confirms with have to and uses must not for a strict prohibition. Traveler 2 uses must for an urgent, self-imposed necessity. The staff then uses don't have to for a lack of necessity based on circumstances.

S

Scenario 3

Work Team Discussion (Email Excerpt)

- Subject: Project Alpha Update

- From: Project Lead

- Hi Team,

Just a reminder that all team members have to attend the meeting on Thursday at 10 AM to discuss Project Alpha. We must make sure everyone is aligned on the next steps. Please come prepared.

- From: Team Member

- Understood. I had to reschedule a client call for that time, but I'll be there. I also heard that only some of us have to present our progress? I hope I don’t have to!

- Analysis: The Project Lead uses have to for an obligatory team meeting. They use must for a strong personal conviction about team alignment. The Team Member uses had to for a past circumstantial necessity and don’t have to to inquire about an optional task.

Quick FAQ

Here are answers to common questions about these two words.
  • Q: Can must and have to always be used interchangeably?
  • A: No. Must primarily indicates an internal, personal necessity or conviction (speaker's strong feeling), whereas have to signals an external, imposed necessity (rules, circumstances, authority). Interchangeable use alters meaning and can sound unnatural.
  • Q: What is the most significant practical difference between mustn't and don't have to?
  • A: Mustn't means prohibition (something is forbidden; you are not allowed). Don't have to means lack of necessity (something is not required; it is optional). This is a fundamental distinction.
  • Q: How do I express past obligation or necessity in English?
  • A: For all past obligations, you must use had to. Must has no specific past tense form for expressing obligation. Example: “I had to finish my homework.”
  • Q: Is one form generally more formal than the other?
  • A: Must can often sound more formal, emphatic, or assertive, particularly in spoken English. Have to is generally more common, flexible, and neutral in everyday conversation for both internal and external obligations. In most informal contexts, have to is preferred.
  • Q: What about the informal phrase “I gotta go”? How does it relate to have to?
  • A: “I gotta go” is a highly informal, spoken contraction of “I have got to go.” The phrase “have got to” carries the exact same meaning as have to when expressing obligation. While common in casual speech, for formal writing and A2 learning, focus on have to.
  • Q: Can must be used for purposes other than obligation?
  • A: Yes. Beyond obligation or strong recommendation, must can be used for logical deduction, expressing a strong belief or conclusion based on evidence (e.g., “He must be home; his car is in the driveway”). This conveys high probability.
  • Q: How does should compare to must and have to?
  • A: Should expresses advice, recommendation, or mild obligation. It suggests something is advisable or a good idea but carries less force than must or have to. Example: “You should get more sleep.”

2. Contractions and Negatives

Full Form Contraction Meaning
must not
mustn't
Forbidden / Prohibition
do not have to
don't have to
Optional / Not necessary
does not have to
doesn't have to
Optional (3rd person)
did not have to
didn't have to
Not necessary in the past

Conjugating Must and Have to

Subject Must (Modal) Have to (Semi-Modal) Past (Obligation)
I
must
have to
had to
You
must
have to
had to
He/She/It
must
has to
had to
We
must
have to
had to
They
must
have to
had to

Meanings

Both 'must' and 'have to' express that something is necessary or required, but they differ in the source of the obligation.

1

Strong Personal Obligation

When the speaker decides something is necessary for themselves.

“I must get more sleep.”

“We must try that new restaurant.”

2

External Obligation

When a rule, law, or another person makes something necessary.

“Students have to arrive on time.”

“Do you have to work on Saturdays?”

3

Prohibition

Using 'must not' or 'mustn't' to say something is forbidden.

“You mustn't smoke here.”

“Visitors must not touch the paintings.”

4

Lack of Necessity

Using 'don't have to' to say something is optional.

“You don't have to come if you're tired.”

“We don't have to wear a tie at the office.”

Reference Table

Reference table for Must vs. Have to: Talking about Necessity
Form Structure Example
Affirmative (Must)
Subject + must + Verb
I must study.
Affirmative (Have to)
Subject + have/has to + Verb
She has to work.
Negative (Prohibition)
Subject + mustn't + Verb
You mustn't smoke.
Negative (Optional)
Subject + don't/doesn't have to + Verb
We don't have to go.
Question (Must)
Must + Subject + Verb?
Must I stay?
Question (Have to)
Do/Does + Subject + have to + Verb?
Do they have to pay?
Past Affirmative
Subject + had to + Verb
I had to leave early.
Past Negative
Subject + didn't have to + Verb
I didn't have to pay.

Formality Spectrum

Formal
It is imperative that we depart immediately.

It is imperative that we depart immediately. (Leaving a location)

Neutral
We must go now.

We must go now. (Leaving a location)

Informal
We have to go.

We have to go. (Leaving a location)

Slang
We gotta bounce.

We gotta bounce. (Leaving a location)

The Source of Obligation

Necessity

Internal (Must)

  • Personal Choice I must eat better.
  • Strong Advice You must see this!

External (Have to)

  • Laws You have to stop at red lights.
  • Work Rules I have to wear a tie.

Mustn't vs. Don't Have To

Mustn't (Prohibition)
Forbidden You mustn't enter.
Don't Have To (Choice)
Optional You don't have to enter.

Which one should I use?

1

Is it a rule from outside?

YES
Use 'Have to'
NO
Is it your own feeling?
2

Is it your own feeling?

YES
Use 'Must'
NO
Use 'Should' for advice
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Examples by Level

1

I must go now.

2

I have to work today.

3

You must eat your vegetables.

4

Do I have to go to bed?

1

You mustn't park here.

2

She doesn't have to cook tonight.

3

We had to wait for an hour.

4

He has to wear a suit at work.

1

You must see the new exhibition; it's amazing!

2

I've got to go, my bus is leaving.

3

You don't have to bring anything to the party.

4

Must we finish this today?

1

The light is on, so they must be home.

2

You must not disclose this information.

3

I didn't have to take the exam because of my grades.

4

Does he have to be so loud?

1

All applicants must submit their portfolios by Friday.

2

One must consider the environmental impact.

3

You needn't have worried about the meeting.

4

It must be noted that the results are preliminary.

1

If you must know, I'm leaving because I'm bored.

2

The law stipulates that citizens must be informed.

3

He has to have been lying all along.

4

Must you always be so contrarian?

Easily Confused

Must vs. Have to: Talking about Necessity vs Must vs. Should

Learners use 'must' when they only want to give a suggestion.

Must vs. Have to: Talking about Necessity vs Mustn't vs. Don't Have To

This is the most common error. Learners think 'mustn't' means 'not necessary'.

Must vs. Have to: Talking about Necessity vs Must vs. Have Got To

Learners don't know when to use the informal 'gotta'.

Common Mistakes

✗

I must to go.

✓

I must go.

Must is a modal verb and is followed by the base verb without 'to'.
✗

He musts study.

✓

He must study.

Modal verbs like 'must' do not take an -s in the third person.
✗

I don't must go.

✓

I mustn't go / I don't have to go.

Must does not use 'do' for negatives.
✗

Must you to stay?

✓

Must you stay?

No 'to' after must in questions.
✗

You mustn't pay; it's free.

✓

You don't have to pay; it's free.

Mustn't means it is forbidden. Don't have to means it is not necessary.
✗

I musted work yesterday.

✓

I had to work yesterday.

Must has no past tense form for obligation.
✗

Do you must go?

✓

Do you have to go? / Must you go?

Must does not use 'do' support in questions.
✗

She has must to go.

✓

She has to go.

You cannot combine 'has' and 'must' this way.
✗

I must have gone yesterday.

✓

I had to go yesterday.

Must have + participle is for deduction (guessing), not for past obligation.
✗

You don't have to smoke here.

✓

You mustn't smoke here.

Using 'don't have to' for a prohibition sounds like smoking is just optional, which is dangerous for rules.
✗

I must to finish my work.

✓

I must finish my work.

Persistent 'to' error even at intermediate levels.
✗

Must I to bring a gift?

✓

Do I have to bring a gift?

Must I is very formal; 'do I have to' is more natural for B1.
✗

It's a must-to-have item.

✓

It's a must-have item.

The compound adjective does not use 'to'.
✗

You mustn't have worried.

✓

You needn't have worried.

Mustn't have is not used for past lack of necessity.
✗

I had must to do it.

✓

I had to do it.

Double modal/auxiliary error.
✗

Must you to be so loud?

✓

Must you be so loud?

Incorrect 'to' in rhetorical questions.

Sentence Patterns

I have to ___ because ___.

You mustn't ___ or you will ___.

In my country, you don't have to ___ but you should ___.

If we want to succeed, we must ___.

Real World Usage

Airport Security very common

You have to take off your shoes.

Doctor's Office common

You must finish the whole course of antibiotics.

Texting a Friend constant

I've gotta go, see ya!

Job Interview occasional

Will I have to travel for this role?

Social Media very common

You MUST try this new filter!

Traffic Signs constant

Drivers must stop for pedestrians.

Food Delivery App common

You have to enter a valid address.

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🎯

The 'Have to' Safety Net

If you aren't sure which one to use, use 'have to'. It is almost never wrong in spoken English, whereas 'must' can sometimes sound too aggressive or formal.
⚠️

The Negative Trap

Always double-check if you mean 'forbidden' or 'optional'. Using 'mustn't' when you mean 'optional' is the most common mistake that confuses native speakers.
💡

Past Tense Rule

Forget 'must' for the past. Just use 'had to'. It works for everything: 'I had to go', 'She had to study', 'They had to leave'.
💬

Recommendations

Use 'must' to be a good friend! 'You must try this pizza' sounds much more enthusiastic and friendly than 'You have to try this pizza'.

Smart Tips

Use 'must' to sound more enthusiastic and warm.

You have to try this cake. → You must try this cake!

Always switch to 'had to'. Don't even think about 'must'.

I must go to the doctor yesterday. → I had to go to the doctor yesterday.

Think 'mustn't'. It helps you associate the word with a hard stop.

I don't have to smoke here. → I mustn't smoke here.

Use 'have to' for rules and 'gotta' for urgent needs.

I must leave now. → I've gotta go!

Pronunciation

/ˈmʌs.ənt/

Mustn't Silent T

The first 't' in 'mustn't' is almost always silent in natural speech.

/ˈhæf.tu/

Have to -> Haftu

In fast speech, 'have to' sounds like 'haftu' and 'has to' sounds like 'hastu'.

/ˈɡɒt.ə/

Gotta

In very informal American English, 'have got to' is reduced to 'gotta'.

Emphasis on Must

You MUST see it!

Conveys strong personal recommendation or urgency.

Rising intonation on questions

Do I have to? ↗

Conveys reluctance or checking a rule.

Memorize It

Mnemonic

Must is for ME (internal), Have to is for the HOUSE (external rules).

Visual Association

Imagine a heart for 'must' (internal feeling) and a heavy law book for 'have to' (external rules).

Rhyme

Must is what I feel inside, Have to is what the rules decide.

Story

A chef says 'I must cook' because he loves it. But at the restaurant, he 'has to cook' because customers are waiting. If he 'mustn't cook', the kitchen is closed. If he 'doesn't have to cook', he can take a break.

Word Web

obligationnecessityrequirementprohibitionoptionalrulelaw

Challenge

Write down 3 things you MUST do for your health and 3 things you HAVE TO do for your job/school today.

Cultural Notes

British speakers use 'must' more frequently for personal obligations than American speakers.

Americans almost exclusively use 'have to' or 'have got to' in speech. 'Must' can sound overly formal or dramatic.

In legal documents, 'shall' was traditionally used, but 'must' is now preferred to clearly indicate a requirement.

'Must' comes from the Old English 'moste', which was actually the past tense of 'motan' (to be allowed/able).

Conversation Starters

“

What are three things you have to do every morning?

“

Do you have to wear a uniform for your job or school?

“

If you could change one law, what would people not have to do anymore?

“

What are some things visitors mustn't do when they visit your country?

Journal Prompts

Write about your dream job. What do you have to do in this job? What don't you have to do?
Describe the rules of your favorite sport or game to someone who has never played.
Reflect on a time you had to make a difficult decision. What were the obligations you felt?
Argue for or against a specific government mandate. Use 'must' and 'have to' to describe the requirements.

Common Mistakes

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

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Test Yourself

Choose the correct modal for a formal rule. Multiple Choice

All passengers ___ show their passports at the gate.

✓ Correct! ✗ Not quite. Correct answer: must
In formal rules, 'must' is used without 'to'.
Fill in the blank with the correct form of 'have to'.

She ___ (work) late every Tuesday.

✓ Correct! ✗ Not quite. Correct answer: has to work
Third-person singular 'she' requires 'has to'.
Correct the mistake in the sentence. Error Correction

Find and fix the mistake:

You mustn't pay for the water; it is free.

✓ Correct! ✗ Not quite. Correct answer: You don't have to pay
'Mustn't' means forbidden. Since the water is free, paying is optional, so we use 'don't have to'.
Change the sentence to the past tense. Sentence Transformation

I must finish my homework today.

✓ Correct! ✗ Not quite. Correct answer: I had to finish
The past tense of 'must' for obligation is 'had to'.
Complete the dialogue. Dialogue Completion

A: Is the museum free? B: No, you ___ buy a ticket.

✓ Correct! ✗ Not quite. Correct answer: have to
Buying a ticket is a requirement (external rule).
Which sentence expresses a PROHIBITION? Grammar Sorting

Select the correct sentence.

✓ Correct! ✗ Not quite. Correct answer: You mustn't eat that.
'Mustn't' is used to forbid an action.
Match the sentence to its meaning. Match Pairs

Match each item on the left with its pair on the right:

✓ Correct! ✗ Not quite. Correct answer: 1-Personal, 2-Optional, 3-Forbidden
Must is personal, don't have to is optional, mustn't is forbidden.
Choose the best fit for a logical guess. Multiple Choice

You've been working for 12 hours! You ___ be exhausted.

✓ Correct! ✗ Not quite. Correct answer: must
'Must' is used for logical deductions where you are almost certain.

Score: /8

Practice Exercises

8 exercises
Choose the correct modal for a formal rule. Multiple Choice

All passengers ___ show their passports at the gate.

✓ Correct! ✗ Not quite. Correct answer: must
In formal rules, 'must' is used without 'to'.
Fill in the blank with the correct form of 'have to'.

She ___ (work) late every Tuesday.

✓ Correct! ✗ Not quite. Correct answer: has to work
Third-person singular 'she' requires 'has to'.
Correct the mistake in the sentence. Error Correction

Find and fix the mistake:

You mustn't pay for the water; it is free.

✓ Correct! ✗ Not quite. Correct answer: You don't have to pay
'Mustn't' means forbidden. Since the water is free, paying is optional, so we use 'don't have to'.
Change the sentence to the past tense. Sentence Transformation

I must finish my homework today.

✓ Correct! ✗ Not quite. Correct answer: I had to finish
The past tense of 'must' for obligation is 'had to'.
Complete the dialogue. Dialogue Completion

A: Is the museum free? B: No, you ___ buy a ticket.

✓ Correct! ✗ Not quite. Correct answer: have to
Buying a ticket is a requirement (external rule).
Which sentence expresses a PROHIBITION? Grammar Sorting

Select the correct sentence.

✓ Correct! ✗ Not quite. Correct answer: You mustn't eat that.
'Mustn't' is used to forbid an action.
Match the sentence to its meaning. Match Pairs

1. I must go. 2. I don't have to go. 3. I mustn't go.

✓ Correct! ✗ Not quite. Correct answer: 1-Personal, 2-Optional, 3-Forbidden
Must is personal, don't have to is optional, mustn't is forbidden.
Choose the best fit for a logical guess. Multiple Choice

You've been working for 12 hours! You ___ be exhausted.

✓ Correct! ✗ Not quite. Correct answer: must
'Must' is used for logical deductions where you are almost certain.

Score: /8

Practice Bank

12 exercises
Choose the correct form Fill in the Blank

He ___ wear a uniform at his new job.

✓ Correct! ✗ Not quite. Correct answer: has to
Choose the correct form Fill in the Blank

I really ___ finish this book, it's so good!

✓ Correct! ✗ Not quite. Correct answer: must
Choose the correct form Fill in the Blank

My boss said we ___ be late for the meeting tomorrow.

✓ Correct! ✗ Not quite. Correct answer: mustn't
Find and fix the mistake Error Correction

She doesn't must go to the office today.

✓ Correct! ✗ Not quite. Correct answer: She doesn't have to go to the office today.
Find and fix the mistake Error Correction

Do you must work on weekends?

✓ Correct! ✗ Not quite. Correct answer: Do you have to work on weekends?
Which sentence means it's optional to attend? Multiple Choice

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: You don't have to attend the seminar.
Which sentence implies a strong personal feeling of obligation? Multiple Choice

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: I must apologize to him.
Type the correct English sentence Translation

Translate into English: 'Ella tuvo que esperar mucho tiempo.'

✓ Correct! ✗ Not quite. Correct answer: ["She had to wait a long time."]
Type the correct English sentence Translation

Translate into English: 'No debes tocar la obra de arte.'

✓ Correct! ✗ Not quite. Correct answer: ["You mustn't touch the artwork.","You must not touch the artwork."]
Put the words in order Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: I have to work today.
Put the words in order Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: You mustn't park here.
Match the phrase with its meaning. Match Pairs

Match the phrase with its meaning.

✓ Correct! ✗ Not quite. Correct answer: matched

Score: /12

FAQ (8)

No, not for obligation. You must use `had to`. If you use `must have`, it means you are making a guess about the past (e.g., 'He must have been tired').

Actually, `must` can sound more bossy or aggressive in some contexts. `Have to` is usually more neutral because it sounds like the rule comes from somewhere else, not just you.

It is an informal version of `have to`. 'I've got to go' is very common in spoken English and is often shortened to 'I gotta'.

It exists, but it is very rare in speech. Americans usually say 'You can't' or 'You're not allowed to' instead of `mustn't`.

`Must` is a modal verb, and modal verbs never change their form. `Have to` is a semi-modal and follows regular verb rules for the third person.

Yes, but it sounds very formal. 'Must you leave so soon?' is correct but sounds like a movie from the 1940s. 'Do you have to leave?' is more modern.

They are very similar. `Need to` focuses more on the necessity for the person, while `have to` focuses more on the requirement or rule.

They are often used for the same thing (prohibition). `Mustn't` is more formal and authoritative; `can't` is more common in daily speech.

Scaffolded Practice

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Mastery Progress

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In Other Languages

Spanish high

tener que / deber

Spanish uses the same verb for 'must' and 'should' (deber), just in different moods.

French moderate

devoir / il faut

French doesn't distinguish between internal and external obligation with different verbs.

German moderate

müssen / nicht dürfen

The negative 'muss nicht' is a 'false friend' for English 'mustn't'.

Japanese low

~nakereba naranai

Japanese uses conditional grammar rather than modal verbs.

Arabic moderate

yajib an (يجب أن)

Arabic uses an impersonal verb rather than a modal that conjugates with the subject.

Chinese moderate

děi (得) / bìxū (必须)

Chinese verbs do not conjugate, so the complexity of 'has to' vs 'have to' is absent.

Learning Path

Prerequisites

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Forbidden Actions: How to use Mustn't

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A2 Builds On

Forbidden Actions: How to use Mustn't

Overview `Mustn't`, a contraction of `must not`, functions as a modal verb indicating **strong prohibition** or a firm i...

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