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'.
Overview
must와 have to는 둘 다 '의무'나 '필요성'을 나타내는 아주 중요한 표현입니다. 한국어로는 둘 다 '해야 한다'라고 해석되지만, 영어에서는 이 두 표현이 가진 '뉘앙스'와 '출처'가 완전히 다릅니다. 우리말에서 '해야 한다'는 문맥에 따라 자연스럽게 이해되지만, 영어에서는 이 구분을 명확히 하지 않으면 상대방에게 의도하지 않은 오해를 줄 수 있습니다.must를 쓰느냐 have to를 쓰느냐에 따라 그 '의무의 근원'이 어디인지가 즉각적으로 드러납니다. must는 주로 말하는 사람의 '내적인 의지'나 '강한 확신'에서 비롯된 의무를 나타내고, have to는 법, 규칙, 상황 등 '외부적인 요인'에 의해 어쩔 수 없이 해야 하는 상황을 나타냅니다. A2 레벨에서는 이 차이를 이해하는 것만으로도 훨씬 원어민스러운 문장을 구사할 수 있게 됩니다.must와 have to의 핵심 차이는 '의무의 방향'입니다. must는 조동사(Modal verb)로, 화자의 주관적인 판단이 강하게 들어갑니다. 예를 들어, I must finish this report.라고 하면 «내 생각에 이 보고서를 끝내는 게 정말 중요해»라는 화자의 개인적인 결심이나 강한 책임감이 담겨 있습니다. 한국어로 치면 '~해야만 해' 혹은 '꼭 ~해야지'와 같은 느낌입니다.
have to는 일반 동사처럼 쓰이며, 외부로부터 주어진 객관적인 의무를 나타냅니다. 예를 들어, I have to finish this report.라고 하면 «상사가 시켰거나 마감 기한이 정해져 있어서 어쩔 수 없이 해야 한다»는 외부적인 압박을 의미합니다. 한국어의 '~해야 한다'라는 일반적인 표현과 가장 비슷합니다.
must는 한국어의 '강한 의지 표명'과 비슷하고, have to는 '사회적 규범이나 상황적 강제'와 비슷합니다.You must try this coffee!라고 한다면, 그것은 단순히 권유하는 것을 넘어 «이 커피는 꼭 마셔봐야 해! (내 강력 추천이야!)»라는 감정적 강조가 들어간 것입니다. 반면
You have to pay for the coffee.는 «(가게 규칙상) 커피값을 내야 한다»는 객관적 사실을 말하는 것이죠.
must는 조동사라서 주어에 따라 변하지 않지만, have to는 일반 동사라서 주어에 따라 has to로 변합니다.- I must study hard. (내 결심)
- She has to study hard. (시험이 있어서)
- You must not smoke here. (금지)
- You don't have to pay. (낼 필요 없음)
must와 have to를 구분해서 사용하는 상황을 일상생활 예시로 알아봅시다.- 1
must를 쓸 때:
- 강한 개인적 의무:
I must call my mom.
(엄마한테 꼭 전화해야지, 내 마음이 그래.) - 강력한 추천:
You must watch this K-drama!
(이 드라마 진짜 대박이야, 꼭 봐!) - 논리적 추론:
The light is on; she must be home.
(불이 켜져 있네? 집에 있는 게 틀림없어.)
- 1
have to를 쓸 때:
- 규칙이나 법:
You have to wear a seatbelt.
(법으로 정해진 것) - 외부 상황:
I have to work late because of the meeting.
(회의 때문에 늦게까지 일해야 해.) - 질문할 때:
Do I have to bring my ID?
(준비물을 물어볼 때는 보통have to를 씁니다.)
- 1
mustn't와don't have to혼동: 한국어로는 둘 다 '안 해도 된다/하면 안 된다'가 섞여서 혼동하기 쉽습니다.mustn't는 '절대 하면 안 됨(금지)',don't have to는 '할 필요 없음(선택)'입니다. "You don't have to worry«라고 해야 할 것을 »You mustn't worry«라고 하면 »걱정하지 마! (걱정하면 안 돼!)"라는 강한 명령조가 되어 버립니다.
- 1과거형에서의 실수:
must는 과거형이 없습니다. 과거의 의무를 말할 때는 무조건had to를 써야 합니다.I must go yesterday
는 틀린 문장이며,I had to go yesterday
가 맞습니다.
- 1의문문에서
must사용:Must you go?처럼must를 의문문에 쓰면 너무 딱딱하고 위압적으로 들립니다. 일상적인 대화에서는 항상Do you have to...?를 사용하는 것이 훨씬 자연스럽습니다.
must와 have to의 차이를 표로 비교해 보겠습니다.must는 왜 부정문에서 '하면 안 된다'가 되나요?must는 '강한 의무'를 나타내는데, 부정형인 must not은 그 의무를 '강하게 금지'하는 것으로 의미가 확장되기 때문입니다.You must come이라고 해도 되나요?have to 대신 got to를 써도 되나요?have to를 줄여서 got to (gonna와 비슷하게 발음)라고 자주 씁니다. 하지만 격식 있는 자리나 글쓰기에서는 have to를 쓰는 것이 좋습니다.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.
Strong Personal Obligation
When the speaker decides something is necessary for themselves.
“I must get more sleep.”
“We must try that new restaurant.”
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?”
Prohibition
Using 'must not' or 'mustn't' to say something is forbidden.
“You mustn't smoke here.”
“Visitors must not touch the paintings.”
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
| 측면 | Must | Have to | 예시 |
|---|---|---|---|
|
의무의 출처
|
내부 (화자의 느낌)
|
외부 (규칙, 법, 상황)
|
I `must` finish this. vs. I `have to` finish this.
|
|
부정형
|
`Mustn't` (금지)
|
`Don't/Doesn't have to` (불필요)
|
You `mustn't` park here. vs. You `don't have to` park here.
|
|
과거 시제
|
의무에 대한 특정 형태 없음 (had to 사용)
|
`Had to`
|
I `had to` leave early.
|
|
의문문
|
드물거나 격식 (Must I...?)
|
흔함 (Do/Does...have to...?)
|
`Do you have to` work today?
|
|
격식
|
더 격식 있고 강조적
|
더 흔하고 유연함
|
You `must` see this! vs. You `have to` see this!
|
|
기본 구조
|
주어 + `must` + 동사 원형
|
주어 + `have/has to` + 동사 원형
|
She `must go`. vs. She `has to go`.
|
격식 수준 스펙트럼
It is imperative that we depart immediately. (Leaving a location)
We must go now. (Leaving a location)
We have to go. (Leaving a location)
We gotta bounce. (Leaving a location)
Must vs. Have to: 핵심 차이점
Must
- 내부적인 느낌 화자의 확신
- 강한 조언 개인적인 추천
- 금지 Mustn't (금지됨)
Have To
- 외부 규칙 법, 상사, 상황
- 일반적인 사용 일상적인 의무
- 불필요 Don't have to (선택 사항)
Must & Have To 비교
Must 또는 Have To 선택하기
의무가 외부 규칙, 법, 또는 상황에서 비롯되었나요?
당신으로부터의 강한 개인적인 느낌, 확신, 또는 추천인가요?
무언가가 금지되거나 허용되지 않는 것에 대한 것인가요?
무언가가 필요하지 않거나 선택 사항인 것에 대한 것인가요?
필요성 스펙트럼
강한 개인적 동기
- • I must apologize.
- • You must try this!
외부 요구사항
- • I have to be at work by 9.
- • Students have to wear uniforms.
금지됨
- • You mustn't touch.
- • We mustn't be late.
선택 사항
- • You don't have to pay.
- • I don't have to rush.
수준별 예문
I must go now.
I need to leave.
I have to work today.
It is my job to work.
You must eat your vegetables.
It is important to eat them.
Do I have to go to bed?
Is it required?
You mustn't park here.
Parking is forbidden.
She doesn't have to cook tonight.
Cooking is optional.
We had to wait for an hour.
It was necessary in the past.
He has to wear a suit at work.
It is a company rule.
You must see the new exhibition; it's amazing!
I strongly recommend it.
I've got to go, my bus is leaving.
Informal necessity.
You don't have to bring anything to the party.
No obligation.
Must we finish this today?
Formal inquiry about necessity.
The light is on, so they must be home.
I am almost certain they are home.
You must not disclose this information.
Confidentiality is required.
I didn't have to take the exam because of my grades.
Exemption from obligation.
Does he have to be so loud?
Annoyance at a behavior.
All applicants must submit their portfolios by Friday.
Official requirement.
One must consider the environmental impact.
General formal necessity.
You needn't have worried about the meeting.
It wasn't necessary, but you did it anyway.
It must be noted that the results are preliminary.
Formal emphasis.
If you must know, I'm leaving because I'm bored.
Sarcastic/reluctant necessity.
The law stipulates that citizens must be informed.
Legal mandate.
He has to have been lying all along.
Strong deduction about the past.
Must you always be so contrarian?
Rhetorical question expressing frustration.
혼동하기 쉬운
Learners use 'must' when they only want to give a suggestion.
This is the most common error. Learners think 'mustn't' means 'not necessary'.
Learners don't know when to use the informal 'gotta'.
자주 하는 실수
I must to go.
I must go.
He musts study.
He must study.
I don't must go.
I mustn't go / I don't have to go.
Must you to stay?
Must you stay?
You mustn't pay; it's free.
You don't have to pay; it's free.
I musted work yesterday.
I had to work yesterday.
Do you must go?
Do you have to go? / Must you go?
She has must to go.
She has to go.
I must have gone yesterday.
I had to go yesterday.
You don't have to smoke here.
You mustn't smoke here.
I must to finish my work.
I must finish my work.
Must I to bring a gift?
Do I have to bring a gift?
It's a must-to-have item.
It's a must-have item.
You mustn't have worried.
You needn't have worried.
I had must to do it.
I had to do it.
Must you to be so loud?
Must you be so loud?
문장 패턴
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
You have to take off your shoes.
You must finish the whole course of antibiotics.
I've gotta go, see ya!
Will I have to travel for this role?
You MUST try this new filter!
Drivers must stop for pedestrians.
You have to enter a valid address.
내부 vs. 외부
부정문에 주의!
과거 시제는 had to!
자연스럽게 말하기
Have to 의문문
Smart Tips
Use 'must' to sound more enthusiastic and warm.
Always switch to 'had to'. Don't even think about 'must'.
Think 'mustn't'. It helps you associate the word with a hard stop.
Use 'have to' for rules and 'gotta' for urgent needs.
발음
Mustn't Silent T
The first 't' in 'mustn't' is almost always silent in natural speech.
Have to -> Haftu
In fast speech, 'have to' sounds like 'haftu' and 'has to' sounds like 'hastu'.
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.
암기하기
기억법
Must is for ME (internal), Have to is for the HOUSE (external rules).
시각적 연상
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
챌린지
Write down 3 things you MUST do for your health and 3 things you HAVE TO do for your job/school today.
문화 노트
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).
대화 시작하기
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?
일기 주제
자주 하는 실수
Test Yourself
You ___ forget to lock the door when you leave.
올바른 문장을 고르세요:
Find and fix the mistake:
I musted go to the dentist yesterday.
Must는 의무를 나타내는 과거 시제가 없습니다. 과거의 필요성에는 had to를 사용합니다.'No tienes que venir si no quieres.'를 영어로 번역하세요.
Answer starts with: ["Y...
Score: /4
연습 문제
8 exercisesAll passengers ___ show their passports at the gate.
She ___ (work) late every Tuesday.
Find and fix the mistake:
You mustn't pay for the water; it is free.
I must finish my homework today.
A: Is the museum free? B: No, you ___ buy a ticket.
Select the correct sentence.
1. I must go. 2. I don't have to go. 3. I mustn't go.
You've been working for 12 hours! You ___ be exhausted.
Score: /8
Practice Bank
12 exercisesHe ___ wear a uniform at his new job.
I really ___ finish this book, it's so good!
My boss said we ___ be late for the meeting tomorrow.
She doesn't must go to the office today.
Do you must work on weekends?
올바른 문장을 고르세요:
올바른 문장을 고르세요:
'Ella tuvo que esperar mucho tiempo.'를 영어로 번역하세요.
'No debes tocar la obra de arte.'를 영어로 번역하세요.
이 단어들을 문장으로 배열하세요:
이 단어들을 문장으로 배열하세요:
구와 그 의미를 연결하세요.
Score: /12
자주 묻는 질문 (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
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
tener que / deber
Spanish uses the same verb for 'must' and 'should' (deber), just in different moods.
devoir / il faut
French doesn't distinguish between internal and external obligation with different verbs.
müssen / nicht dürfen
The negative 'muss nicht' is a 'false friend' for English 'mustn't'.
~nakereba naranai
Japanese uses conditional grammar rather than modal verbs.
yajib an (يجب أن)
Arabic uses an impersonal verb rather than a modal that conjugates with the subject.
děi (得) / bìxū (必须)
Chinese verbs do not conjugate, so the complexity of 'has to' vs 'have to' is absent.
Learning Path
Prerequisites
Continue With
관련 동영상
05:29 What I Learned from Cooking My Way Across a Continent | Dieuveil Malonga | TED
03:11 Which Sidekick Notepad Is For You?
08:02 How to Become a K-pop Superstar — in 7 Minutes | Charlene Kaye | TED
MUST, HAVE TO 헷갈려? 1분만에 정리해 줄게! (+응용편) | 잉글리쉬고
잉글리쉬고 EnglishGo
MUST와 HAVE TO의 차이점! - 잉글리쉬인코리아
EnglishinKorea
must, have to, should의 차이점 제대로 배우기
라이브아카데미 Live Academy
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