B1 verb #38 よく出る 4分で読める

assure

To tell someone something to help them feel less worried.

Explanation at your level:

When you tell someone that everything will be okay, you assure them. It is a kind word. If your friend is sad, you can say, 'I assure you, it will be fine.' It helps them feel happy and safe. You use it when you want to stop someone from worrying. It is like a promise of good things.

To assure means to tell someone that something is definitely true. You might use this when a friend is worried about a test. You can say, 'I assure you that you studied enough.' It is a very helpful word to use in school or at home. It makes people feel calm because they trust your words. Remember to always say who you are talking to, like 'I assure you.'

The verb assure is used to remove doubt. When you are at work or talking to a teacher, you can use it to sound more confident and reliable. For example, 'The manager assured the team that their jobs were safe.' It is more formal than saying 'I promise.' Use it when you want to show that you have checked the facts and everything is under control. It is a great word for building trust in relationships.

In B2 English, assure is often used to manage expectations in professional or social settings. You might say, 'I can assure you that the quality meets our standards.' It is a sophisticated way to handle skepticism. Unlike 'reassure' (which means to make someone feel less worried about something they were already worried about), 'assure' is about providing a guarantee or a firm statement of fact. It is essential for clear, persuasive communication in business or academic writing.

At the C1 level, assure functions as a tool for rhetorical authority. It is frequently used in political, legal, and formal discourse to project stability. You might encounter phrases like 'the government sought to assure the public of its commitment.' It implies a weight of responsibility. Note the nuance: while 'ensure' means to make certain that something happens, 'assure' is strictly about the verbal act of removing doubt from a person's mind. Mastering this distinction is a hallmark of advanced proficiency.

At the C2 level, we look at the etymological depth of assure. It is rooted in the concept of 'securing' reality through language. In literary contexts, it can be used with irony—where a character 'assures' another, yet the reader knows the truth is otherwise. It is also common in high-stakes negotiations where the 'assurance' is a currency of trust. You should be comfortable using it in complex structures, such as passive voice constructions ('The public was assured that...') or as a participle ('Self-assured, she walked into the room'). It remains a cornerstone of articulate, persuasive, and empathetic English expression.

30秒でわかる単語

  • Assure means to remove doubt.
  • Always use it with a person.
  • Commonly used as 'Rest assured'.
  • Different from ensure and insure.

When you assure someone, you are acting as a pillar of support. You are essentially giving them your word that a situation is under control or that a specific outcome is guaranteed. It is more than just telling; it is about instilling confidence.

Think of it as a verbal hug for a worried mind. Whether you are a boss telling an employee that their job is safe, or a parent telling a child that the monster under the bed isn't real, you are using the power of assurance to calm nerves.

The key here is the intent. You aren't just sharing information; you are actively working to dissolve someone's anxiety. It is a beautiful, empathetic way to use language to build stronger, more trusting relationships with the people around you.

The word assure has a lovely, secure history. It traces back to the Old French word asseurer, which itself comes from the Latin assecurare. If you look closely, you can see the root securus, which means 'safe' or 'secure'.

Back in the 14th century, it entered Middle English as a way to describe making something 'sure' or 'certain'. It is a cousin to words like ensure and insure, though they have drifted apart in meaning over the centuries. Originally, it was heavily used in legal and formal contexts to guarantee a promise or a contract.

Over time, the word softened. While we still use it in business, it became a staple of human interaction. It is fascinating how a word that once meant 'to make safe' evolved into a tool for emotional comfort. It reminds us that language is a living, breathing thing that adapts to our human need for connection and peace of mind.

Using assure correctly is all about the structure: you assure someone of something or you assure someone that.... It is a transitive verb, meaning it almost always needs an object—the person you are talking to.

In a professional register, you might hear, 'I can assure you that the project will be finished on time.' This is a classic, reliable way to build trust with a client or a manager. It sounds professional, calm, and authoritative.

In casual conversation, it is slightly less common than 'promise,' but it carries more weight. If you say, 'I promise,' you are making a commitment. If you say, 'I assure you,' you are telling the other person they have nothing to worry about. It is a subtle but important difference in tone that native speakers use to manage the emotional temperature of a conversation.

While 'assure' is a direct verb, it appears in many comforting expressions. 1. Rest assured: This is the most common way to use it, meaning 'you can be certain.' Example: 'Rest assured, we are doing everything we can.' 2. Give assurance: To provide a formal guarantee. Example: 'The company gave assurances that prices would not rise.' 3. Self-assured: Having confidence in one's own abilities. Example: 'She gave a very self-assured presentation.' 4. Assure oneself: To make certain for one's own peace of mind. Example: 'I checked the locks to assure myself we were safe.' 5. Take as an assurance: To accept a statement as the truth. Example: 'You can take my word as an assurance of my loyalty.' These idioms help you sound more natural and fluent when providing comfort or certainty.

Pronunciation is straightforward but requires a soft touch. In both British and American English, the IPA is /əˈʃʊər/. The stress is on the second syllable. It rhymes with pure, cure, and tour.

Grammatically, remember that you assure a person, not a thing. You don't 'assure the problem'; you 'assure the person about the problem.' The most common pattern is Subject + Assure + Indirect Object + That-clause. For example: 'He assured me that he would arrive by noon.'

It is not a countable noun, so you won't see plural forms like 'assures' unless you are talking about the third-person singular verb conjugation. Keep your sentences clean by always including the 'who' in your sentence. If you forget to include the person you are talking to, the sentence can sound a bit clunky or incomplete to a native ear.

Fun Fact

It shares a root with the word 'secure'.

Pronunciation Guide

UK əˈʃʊər

Sounds like 'a-shure' with a soft 'sh'.

US əˈʃʊr

Similar to UK but with a stronger 'r' sound.

Common Errors

  • Pronouncing it like 'a-sure' (missing the 'sh' sound)
  • Putting stress on the first syllable
  • Confusing it with 'ensure'

Rhymes With

pure cure tour lure endure

Difficulty Rating

読解 2/5

Easy to read

Writing 3/5

Requires correct object usage

Speaking 2/5

Common in daily speech

リスニング 2/5

Clear pronunciation

What to Learn Next

Prerequisites

tell say promise

Learn Next

ensure insure reassure

上級

certify guarantee affirm

Grammar to Know

Transitive Verbs

I assure you.

Indirect Objects

I assure [him].

That Clauses

I assure you [that he is fine].

Examples by Level

1

I assure you, it is fine.

I promise you, it is okay.

Subject + verb + object.

2

He assured me.

He told me not to worry.

Simple past.

3

She assured the kids.

She made the kids feel safe.

Past tense.

4

I assure you, I am here.

I promise I am staying.

Present tense.

5

They assured us.

They told us the truth.

Past tense.

6

Please assure me.

Please tell me it's okay.

Imperative.

7

I assure you, it works.

I promise the machine works.

Present tense.

8

We assure you now.

We are telling you now.

Present tense.

1

I can assure you that the bus will be on time.

2

She assured her parents that she was safe.

3

The doctor assured the patient that the medicine would help.

4

I assure you, I didn't lose your book.

5

He assured me that he would come to the party.

6

They assured us that the hotel was very nice.

7

Can you assure me that this is true?

8

I assure you, everything is under control.

1

The CEO assured the shareholders that the company was growing.

2

I want to assure you that I am fully committed to this project.

3

She assured him that she had finished the report on time.

4

The guide assured us that the path was safe to walk.

5

He assured the teacher that he had done his homework.

6

We were assured that the flight would not be delayed.

7

I can assure you that you have nothing to worry about.

8

She assured me that she would keep my secret.

1

The government sought to assure the public that the economy was stable.

2

I can assure you that your concerns have been noted.

3

He was assured that his promotion was being considered.

4

She assured herself that she had made the right decision.

5

The technician assured me that the repair was permanent.

6

We were assured of a warm welcome at the event.

7

They assured us that the deadline was flexible.

8

He gave me his word to assure me of his support.

1

The diplomat assured his counterpart of his nation's peaceful intentions.

2

She was assured that the evidence would be presented in court.

3

The architect assured the client that the structure was sound.

4

He sought to assure his critics of his sincerity.

5

The report served to assure the board that the strategy was working.

6

I assure you, the implications of this decision are vast.

7

They were assured that the transition would be seamless.

8

The captain assured the passengers of their safety during the storm.

1

His self-assured manner left no room for doubt.

2

The poet assured the reader of the beauty in the mundane.

3

She was assured of her place in history by her peers.

4

The king assured his subjects of his unwavering protection.

5

He assured himself that the path taken was the only one possible.

6

The contract was designed to assure the parties of their rights.

7

She assured them that the outcome was inevitable.

8

The silence was meant to assure us of the gravity of the situation.

よく使う組み合わせ

assure someone that
rest assured
give an assurance
self-assured
assure someone of
solemnly assure
repeatedly assure
assure the public
assure the success
fully assure

Idioms & Expressions

"rest assured"

be certain; stop worrying

Rest assured, the package is on its way.

neutral

"give assurances"

provide formal promises

The bank gave assurances about our savings.

formal

"self-assured"

confident in oneself

He walked in with a self-assured smile.

neutral

"take as an assurance"

accept a statement as truth

You can take my promise as an assurance.

formal

"assure oneself of"

to confirm for personal peace

I checked to assure myself of the facts.

neutral

"assure the future"

to guarantee success later

This investment will assure the future of the company.

formal

Easily Confused

assure vs Ensure

Similar sound

Ensure = make certain, Assure = tell a person

I ensure the work is done vs I assure you it is done.

assure vs Insure

Similar sound

Insure = financial protection

I insure my car.

assure vs Persuade

Both involve talking

Persuade = change a mind

I persuaded him to go.

assure vs Promise

Both involve commitment

Promise = commitment to action

I promise to help.

Sentence Patterns

A2

Subject + assure + person + that + clause

I assure you that I will be there.

B1

Subject + assure + person + of + noun

He assured me of his help.

B2

Rest assured + that + clause

Rest assured that we are helping.

B2

Subject + be + assured + that + clause

They were assured that it was safe.

C1

Subject + assure + oneself + of + noun

She assured herself of the facts.

語族

Nouns

assurance a statement of confidence

Verbs

reassure to assure again

Adjectives

assured confident

関連

ensure similar sound, different meaning

How to Use It

frequency

7

Formality Scale

Formal (contracts) Neutral (work) Casual (friends) N/A

よくある間違い

Assure the problem Assure the person
You assure people, not things.
I assure that... I assure you that...
You need an indirect object.
Assure vs Ensure Use ensure for results
Ensure means to make certain something happens.
Assure vs Insure Use insure for money
Insure is for financial protection.
Assuring to someone Assuring someone
No preposition needed after the verb.

Tips

💡

Memory Palace Trick

Imagine a person 'sure' of themselves standing in a palace.

💡

When Native Speakers Use It

When someone is nervous about a deadline.

🌍

Cultural Insight

Used often in customer support to show care.

💡

Grammar Shortcut

Always follow with 'you' or another person.

💡

Say It Right

Focus on the 'sh' sound.

💡

Don't Make This Mistake

Don't use it with objects.

💡

Did You Know?

It comes from the Latin for 'safe'.

💡

Study Smart

Learn it with 'reassure' to see the difference.

💡

Writing Tip

Use it to add authority to your emails.

💡

Speaking Hack

Use 'Rest assured' to sound more professional.

Memorize It

Mnemonic

A-Sure: You make someone 'a sure' person by removing doubt.

Visual Association

A calm anchor in a storm.

Word Web

Trust Confidence Certainty Peace Promise

チャレンジ

Tell a friend three things you can assure them about today.

語源

Latin

Original meaning: To make safe

文化的な背景

None, generally very positive.

Common in customer service and professional settings.

Used in many classic speeches to provide comfort. Commonly used in legal contracts.

Practice in Real Life

Real-World Contexts

At work

  • I can assure you
  • Rest assured
  • We have received assurances

At school

  • The teacher assured me
  • I assure you it's correct

Travel

  • The guide assured us
  • We were assured of safety

Customer service

  • I assure you we will fix it
  • Please be assured

Conversation Starters

"Who is someone you always assure when they are worried?"

"When was the last time someone assured you about something?"

"Do you find it easy to assure others?"

"What is the difference between assuring and promising?"

"Why is it important to assure people in business?"

Journal Prompts

Write about a time you felt worried and someone assured you.

Describe a situation where you had to assure someone else.

Explain why 'assuring' is a key part of leadership.

How does it feel to be 'self-assured'?

よくある質問

8 問

No, assure is for people, ensure is for outcomes.

No, you must assure a person.

It can be both formal and casual.

Uh-SHUR.

Assurance.

Yes, assured.

Doubt or alarm.

Yes, very common in English.

自分をテスト

fill blank A1

I ___ you that it is fine.

正解! おしい! 正解: assure

Assure is the verb for giving confidence.

multiple choice A2

What does 'assure' mean?

正解! おしい! 正解: To make someone feel safe

Assure is about removing doubt.

true false B1

You can 'assure' a table.

正解! おしい! 正解: 間違い

You assure people, not objects.

match pairs B1

Word

意味

All matched!

These are common uses.

sentence order B2

下の単語をタップして文を組み立てよう
正解! おしい! 正解:

Subject + verb + indirect object + that clause.

fill blank B2

The manager ___ the staff that the bonus was coming.

正解! おしい! 正解: assured

Past tense verb is needed.

multiple choice C1

Which is the correct usage?

正解! おしい! 正解: I assure you of the project.

Assure + person + of + thing.

true false C1

Assure and Ensure are interchangeable.

正解! おしい! 正解: 間違い

They have different meanings.

match pairs C2

Word

意味

All matched!

Adjective and adverb forms.

sentence order C2

下の単語をタップして文を組み立てよう
正解! おしい! 正解:

He assured us of his success.

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