At the A1 level, you can think of ascertain as a very formal way to say 'find out.' If you want to know the time, you look at a clock to find out. If a scientist wants to know why a plant died, they ascertain the cause. It is a big word for a simple idea: getting the right answer.
When you are at the A2 level, you start to see that some words are for friends and some are for work. Ascertain is definitely for work or school. You use it when you have to be very careful and sure about what you are saying. For example, 'The police wanted to ascertain who was in the building.'
As you move to B1, you can use ascertain to sound more professional. It is great for writing emails or reports. Instead of saying 'I checked the numbers,' you can say 'I ascertained the numbers were correct.' It shows you are serious and pay attention to detail.
At the B2 level, you understand that ascertain implies an investigative process. It is not just looking; it is researching. You use it when there is doubt or a mystery to solve. It fits perfectly in academic essays where you need to verify your sources and evidence clearly.
C1 learners recognize the nuance of ascertain as a tool for establishing objective truth. It is often used in investigative journalism, legal proceedings, and scientific research. It suggests a methodical approach to knowledge, distinguishing between mere opinion and verified fact. Using this word effectively elevates your discourse, signaling a high level of linguistic control and analytical rigor.
At the C2 level, you appreciate the etymological weight of ascertain. It is rooted in the pursuit of 'certainty' (certus). In literary and high-level academic contexts, it is used to describe the intellectual labor required to pierce through ambiguity. It is the verb of the researcher, the judge, and the philosopher—anyone tasked with distilling truth from a complex reality. Its usage marks a transition from simple communication to precise, authoritative expression.
ascertain 30秒で
- Ascertain means to find out for sure.
- It is a formal verb used in investigation.
- It is not for casual daily conversation.
- It rhymes with 'maintain'.
When you ascertain something, you are moving beyond guessing. It is the act of finding out the truth with total certainty.
Think of it as the ultimate form of 'checking.' You don't just look; you investigate, analyze, and verify until you have a solid answer. It is a very precise word that suggests you have put in the effort to eliminate any doubt.
You might ascertain the cause of a problem at work, or perhaps ascertain whether a friend is telling the truth. It is a sophisticated way of saying 'find out,' but it carries much more weight and authority.
The word ascertain has a fascinating journey through history. It comes from the Old French word acertainer, which meant 'to make certain.'
This, in turn, traces back to the Medieval Latin certus, meaning 'fixed' or 'settled.' When you break it down, it literally means 'to make something certain.' It entered the English language in the 14th century, originally used in legal and formal contexts to describe making a fact known or settled.
Over the centuries, it evolved from simply 'making sure' to the investigative process we use today. It is a classic example of how English borrows from French and Latin to create words that sound more professional and precise than their Germanic counterparts.
You will mostly see ascertain in formal or academic writing. It is rarely used in casual, everyday conversation—you wouldn't say 'I need to ascertain what's for dinner!'
Instead, it shines in reports, legal documents, or serious discussions. Common collocations include ascertain the cause, ascertain the truth, and ascertain whether.
Because it is a high-register word, using it in the right context makes you sound very authoritative and thorough. It implies that you have done your homework and are speaking from a position of verified knowledge.
While ascertain itself is a formal verb, it relates to several idioms about finding the truth:
- Get to the bottom of: To investigate until you find the truth.
- Leave no stone unturned: To search everywhere to ascertain the facts.
- Get the facts straight: To ensure your information is correct.
- See for oneself: To verify something by personal observation.
- Put to the test: To verify a theory through experimentation.
Ascertain is a regular verb. Its forms are: ascertains (present), ascertained (past), and ascertaining (participle).
In terms of pronunciation, it is as-er-TANE. The stress is on the final syllable. It rhymes with words like 'maintain,' 'attain,' and 'sustain.'
It is almost always used as a transitive verb, meaning it needs an object. You don't just 'ascertain'; you 'ascertain the facts' or 'ascertain whether it is true.'
豆知識
It shares a root with 'certain', 'certify', and 'certificate'.
発音ガイド
- Misplacing the stress on the first syllable
- Pronouncing it like 'as-certain' as two words
- Dropping the 't' sound
難易度
Formal vocabulary
Requires context awareness
Rarely used in casual speech
Common in news/academic contexts
次に学ぶべきこと
前提知識
次に学ぶ
上級
知っておくべき文法
Transitive Verbs
I ascertained the facts.
Reporting Verbs
He ascertained that it was true.
Formal Register
Use in professional writing.
レベル別の例文
I want to ascertain the time.
I want to find out the time.
Verb + object
He will ascertain the truth.
He will find the truth.
Future tense
Did you ascertain the name?
Did you find the name?
Question form
They ascertain the facts.
They find the facts.
Present simple
I must ascertain the cost.
I must find the price.
Modal verb
She ascertained the problem.
She found the problem.
Past tense
We need to ascertain this.
We need to know this.
Infinitive
Can you ascertain the location?
Can you find the place?
Modal verb
The doctor tried to ascertain the cause of the illness.
We need to ascertain whether the train is on time.
The police ascertained that the door was locked.
She ascertained the facts before speaking.
It is hard to ascertain the true cost.
Did you ascertain if he is coming?
They ascertained the location of the fire.
I am trying to ascertain the reason for the delay.
The committee met to ascertain the best course of action.
Scientists are working to ascertain the long-term effects.
He was unable to ascertain the identity of the caller.
Please ascertain if the room is available for Friday.
We must ascertain the extent of the damage.
The auditor will ascertain whether the accounts are accurate.
Can you ascertain the source of this rumor?
The team ascertained that the project was behind schedule.
The investigators sought to ascertain the sequence of events.
It is crucial to ascertain the validity of these claims.
The report aims to ascertain the root cause of the failure.
We have yet to ascertain the full scope of the problem.
The study was designed to ascertain the impact of climate change.
She managed to ascertain the truth through careful questioning.
The authorities are trying to ascertain the motive behind the crime.
It is difficult to ascertain the exact date of the building's origin.
The historian attempted to ascertain the authenticity of the ancient manuscript.
The court must ascertain whether the evidence is admissible.
We need to ascertain the feasibility of the proposed expansion.
The researchers ascertained a correlation between the two variables.
He spent years trying to ascertain the lineage of his ancestors.
The panel was tasked with ascertaining the truth regarding the incident.
One must ascertain the underlying assumptions of the argument.
The software is designed to ascertain potential security vulnerabilities.
The scholar sought to ascertain the nuances of the original text.
The investigation served to ascertain the veracity of the witness's testimony.
We must ascertain the ontological status of the phenomenon.
The architect needed to ascertain the structural integrity of the ruins.
The diplomat worked to ascertain the intentions of the foreign delegation.
It is imperative to ascertain the parameters of the experiment.
The detective ascertained the hidden motive through subtle clues.
The study ascertains a clear link between lifestyle and longevity.
よく使う組み合わせ
慣用句と表現
"get to the bottom of"
to find the truth
We need to get to the bottom of this issue.
neutral"leave no stone unturned"
to search thoroughly
The police left no stone unturned to find the truth.
neutral"get the facts straight"
to be accurate
Let's get our facts straight before the meeting.
neutral"see for oneself"
to verify personally
You should go and see for yourself.
casual"put to the test"
to check through action
We will put the new theory to the test.
neutral"read between the lines"
to find hidden meaning
I had to read between the lines to ascertain his intent.
neutral間違えやすい
Sounds similar
Assure means to promise; ascertain means to find out.
I assure you I will ascertain the truth.
Similar spelling
Assert means to state strongly; ascertain means to find out.
He asserted his innocence after we ascertained the facts.
Similar sound
Ascent is the act of climbing; ascertain is a verb.
The ascent was hard, but we ascertained the peak's height.
It is the root
Certain is an adjective; ascertain is a verb.
I am certain I can ascertain the facts.
文型パターン
Subject + ascertain + object
We ascertained the facts.
Subject + ascertain + whether
I must ascertain whether he is coming.
Subject + ascertain + that
They ascertained that the door was locked.
Subject + try to + ascertain
I am trying to ascertain the cause.
Subject + need to + ascertain
We need to ascertain the truth.
語族
名詞
動詞
形容詞
関連
使い方
6/10
-
Using 'ascertain' for simple things
→
Use 'find out'
Ascertain is too formal for 'finding out' what is for dinner.
-
ascertain to the truth
→
ascertain the truth
Ascertain is a transitive verb; it doesn't need 'to'.
-
ascertaining me the truth
→
ascertaining the truth for me
It does not take an indirect object in this way.
-
I ascertained him
→
I ascertained the facts from him
You ascertain facts, not people.
-
ascertained it as true
→
ascertained that it was true
Follow with a 'that' clause or direct object.
ヒント
Memory Palace
Imagine a judge with a magnifying glass.
Professional Email
Use it to sound thorough.
Detective Fiction
Read Sherlock Holmes to see it in action.
Verb Patterns
Always follow with an object or clause.
Stress
Stress the third syllable.
Don't over-use
Keep it for serious topics.
Etymology
Linked to 'certain'.
Flashcards
Pair with 'verify'.
暗記しよう
記憶術
Ass-er-tain: I 'assure' myself of 'certain' facts.
視覚的連想
A detective looking through a magnifying glass at a clue.
Word Web
チャレンジ
Try to use 'ascertain' in a formal email today.
語源
Old French / Latin
元の意味： To make certain
文化的な背景
None, it is a neutral, professional term.
Common in professional, legal, and academic settings.
実生活で練習する
実際の使用場面
Work
- ascertain the cause
- ascertain the status
- ascertain the requirements
School
- ascertain the meaning
- ascertain the source
- ascertain the facts
Legal
- ascertain the truth
- ascertain the identity
- ascertain the evidence
Science
- ascertain the results
- ascertain the data
- ascertain the correlation
会話のきっかけ
"How do you usually ascertain the truth when you hear a rumor?"
"What is the most difficult thing you have ever had to ascertain?"
"Why do you think people prefer to 'find out' rather than 'ascertain'?"
"In what professional situations is it best to use the word ascertain?"
"Can you think of a mystery you would like to ascertain the answer to?"
日記のテーマ
Write about a time you had to investigate something to ascertain the truth.
Describe a situation where it was impossible to ascertain the facts.
How does using precise language like 'ascertain' change how people perceive you?
Reflect on the difference between guessing and ascertaining.
よくある質問
8 問It is common in professional writing but rare in casual speech.
It might sound a bit funny or overly serious.
Ascertain is more formal and implies investigation.
Yes, it follows standard conjugation rules.
No, it is the opposite of guessing.
as-er-TANE.
Yes, it is excellent for academic writing.
Yes, it is standard in both.
自分をテスト 5 問
I need to ___ the time of the meeting.
Ascertain means to find out.
Which of these means to find out for sure?
Ascertain is the formal term for finding out.
You can use 'ascertain' to describe finding your keys in the morning.
It is too formal for daily tasks.
/ 5 correct
Perfect score!
Summary
Ascertain is the formal, detective-like way to say you have found the absolute truth.
- Ascertain means to find out for sure.
- It is a formal verb used in investigation.
- It is not for casual daily conversation.
- It rhymes with 'maintain'.
Memory Palace
Imagine a judge with a magnifying glass.
Professional Email
Use it to sound thorough.
Detective Fiction
Read Sherlock Holmes to see it in action.
Verb Patterns
Always follow with an object or clause.
例文
I need to ascertain whether the pharmacy is still open before we drive all the way there.
関連コンテンツ
Educationの関連語
chair
A1椅子は一人が座るための家具です。通常、背もたれと脚があり、快適に座ることができます。
dictionary
A1辞書は、言語の単語をアルファベット順にリストした本または電子リソースです。単語の意味と発音について説明します。
abstruse
C1Describing something that is difficult to understand because it is intellectual, complex, or obscure. It is typically used for subjects, theories, or language that require significant effort or specialized knowledge to grasp.
noncitible
C1情報源や資料を、正式な引用や学術的参照の対象外として指定すること。
memorize
A1暗記するとは、記憶から繰り返せるほどよく学ぶことです。情報を心に留めるプロセスです。
exscribency
C1The act or practice of copying out or transcribing text from an original source. It refers to the systematic process of writing out information to create a secondary record or duplicate.
academic
A2Relating to schools, colleges, and universities, or connected to studying and thinking rather than practical or technical skills. It is often used to describe subjects like history, math, and science that are studied in an educational setting.
informist
C1特定の対象に対して、専門的な情報を体系的かつ公式に伝えること。
acquire
A2To obtain or get something, such as a physical object, a skill, or knowledge, often through effort or purchase. It is frequently used to describe a gradual process of learning or a formal business transaction.
langfocus
B1A feature or mode within a learning tool that narrows the user's attention to a specific aspect of the language being studied, such as grammar, vocabulary, or pronunciation. It provides a concentrated learning experience by filtering out other linguistic elements to help master a particular skill.
