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
Sounds like 'a-shure' with a soft 'sh'.
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
Difficulty Rating
Easy to read
Requires correct object usage
Common in daily speech
Clear pronunciation
What to Learn Next
Prerequisites
Learn Next
上級
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
I assure you, it is fine.
I promise you, it is okay.
Subject + verb + object.
He assured me.
He told me not to worry.
Simple past.
She assured the kids.
She made the kids feel safe.
Past tense.
I assure you, I am here.
I promise I am staying.
Present tense.
They assured us.
They told us the truth.
Past tense.
Please assure me.
Please tell me it's okay.
Imperative.
I assure you, it works.
I promise the machine works.
Present tense.
We assure you now.
We are telling you now.
Present tense.
I can assure you that the bus will be on time.
She assured her parents that she was safe.
The doctor assured the patient that the medicine would help.
I assure you, I didn't lose your book.
He assured me that he would come to the party.
They assured us that the hotel was very nice.
Can you assure me that this is true?
I assure you, everything is under control.
The CEO assured the shareholders that the company was growing.
I want to assure you that I am fully committed to this project.
She assured him that she had finished the report on time.
The guide assured us that the path was safe to walk.
He assured the teacher that he had done his homework.
We were assured that the flight would not be delayed.
I can assure you that you have nothing to worry about.
She assured me that she would keep my secret.
The government sought to assure the public that the economy was stable.
I can assure you that your concerns have been noted.
He was assured that his promotion was being considered.
She assured herself that she had made the right decision.
The technician assured me that the repair was permanent.
We were assured of a warm welcome at the event.
They assured us that the deadline was flexible.
He gave me his word to assure me of his support.
The diplomat assured his counterpart of his nation's peaceful intentions.
She was assured that the evidence would be presented in court.
The architect assured the client that the structure was sound.
He sought to assure his critics of his sincerity.
The report served to assure the board that the strategy was working.
I assure you, the implications of this decision are vast.
They were assured that the transition would be seamless.
The captain assured the passengers of their safety during the storm.
His self-assured manner left no room for doubt.
The poet assured the reader of the beauty in the mundane.
She was assured of her place in history by her peers.
The king assured his subjects of his unwavering protection.
He assured himself that the path taken was the only one possible.
The contract was designed to assure the parties of their rights.
She assured them that the outcome was inevitable.
The silence was meant to assure us of the gravity of the situation.
よく使う組み合わせ
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.
formalEasily Confused
Similar sound
Ensure = make certain, Assure = tell a person
I ensure the work is done vs I assure you it is done.
Similar sound
Insure = financial protection
I insure my car.
Both involve talking
Persuade = change a mind
I persuaded him to go.
Both involve commitment
Promise = commitment to action
I promise to help.
Sentence Patterns
Subject + assure + person + that + clause
I assure you that I will be there.
Subject + assure + person + of + noun
He assured me of his help.
Rest assured + that + clause
Rest assured that we are helping.
Subject + be + assured + that + clause
They were assured that it was safe.
Subject + assure + oneself + of + noun
She assured herself of the facts.
語族
Nouns
Verbs
Adjectives
関連
How to Use It
7
Formality Scale
よくある間違い
You assure people, not things.
You need an indirect object.
Ensure means to make certain something happens.
Insure is for financial protection.
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
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.
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
I ___ you that it is fine.
Assure is the verb for giving confidence.
What does 'assure' mean?
Assure is about removing doubt.
You can 'assure' a table.
You assure people, not objects.
Word
意味
These are common uses.
Subject + verb + indirect object + that clause.
The manager ___ the staff that the bonus was coming.
Past tense verb is needed.
Which is the correct usage?
Assure + person + of + thing.
Assure and Ensure are interchangeable.
They have different meanings.
Word
意味
Adjective and adverb forms.
He assured us of his success.
スコア: /10
Summary
To assure someone is to use your words as a bridge to their peace of mind.
- Assure means to remove doubt.
- Always use it with a person.
- Commonly used as 'Rest assured'.
- Different from ensure and insure.
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.