it の強調構文をマスターするための例文集！it is likely that ~【It-cleft sentence】

「It is 形容詞 that 主語 動詞」という構文は、強調構文（cleft sentence）」の一種で、ある文の一部（特に主語や動詞が関わる部分）を強調するために使われるよ。（It-cleft sentence）

この構文で、どの部分が大事か、際立たせたいか、示すことができるよ。日本語では「～するのは～だ」「～ということが～だ」といったニュアンスに近い。

1. 構文の基本形

構文の基本形は、

「It is + 形容詞 + that + 主語 + 動詞」

だよ。

例えば：

• It is clear that he didn’t understand.
  （彼が理解していないのは明らかだ。）
  → 「It is clear（明らかだ）」が主な主張で、「that he didn’t understand（彼が理解していない）」がその内容。

この構文のポイント：

• It: 形式主語で、実際の内容は「that」以下にくる。
• is: 形容詞と「that」節をつなぐ。
• 形容詞: 状況を評価するキーワード。
• that: 具体的な内容を示す節を導く（会話では省略されることもある）。
• 副詞: 形容詞を修飾して、程度やニュアンスを加える（例: very, quite, absolutely）。

日本語では「～するのは～だ」と自然に訳されることが多いけど、形容詞によっては意訳が必要だね（例: It is unlikely that… → 「～とは思えない」）。

2. よく使われる形容詞30個と例文

possible

• It is possible that she knows the truth.
  （彼女が真実を知っている可能性がある。）
• It is possible that they missed the train yesterday.
  （彼らが昨日電車に乗り遅れた可能性がある。）
• It is quite possible that he is still asleep.
  （彼はまだ寝ている可能性が高い。）
• It is entirely possible that she forgot to call last night.
  （彼女が昨夜電話をかけるのを忘れた可能性は十分にある。）
• It is hardly possible that he finished it alone.
  （彼が一人でそれを終えた可能性はほとんどない。）

true

• It is true that she loves chocolate.
  （彼女がチョコレートを好きなのは本当だ。）
• It is true that they have lived here for years.
  （彼らが何年もここに住んでいるのは本当だ。）
• It is absolutely true that he saw the accident.
  （彼がその事故を見たのは絶対に本当だ。）
• It is completely true that we finished on time.
  （私たちが時間通りに終えたのは完全に本当だ。）
• It is never true that he lied to us.
  （彼が私たちに嘘をついたなんて絶対にありえない。）

certain

• It is certain that they will win.
  （彼らが勝つのは確かだ。）
• It is certain that he knew the plan.
  （彼がその計画を知っていたのは確かだ。）
• It is quite certain that she will arrive late.
  （彼女が遅れて着くのはかなり確かだ。）
• It is absolutely certain that we made the right choice.
  （私たちが正しい選択をしたのは絶対に確かだ。）

likely

• It is likely that it will rain this afternoon.
  （午後に雨が降る可能性が高い。）
• It is likely that she heard the news.
  （彼女がそのニュースを聞いた可能性が高い。）
• It is very likely that he will agree.
  （彼が同意する可能性はとても高い。）
• It is highly likely that they forgot the deadline.
  （彼らが締め切りを忘れた可能性は非常に高い。）
• It is hardly likely that she will change her mind.
  （彼女が考えを変える可能性はほとんどない。）

clear

• It is clear that he didn’t understand.
  （彼が理解していないのは明らかだ。）
• It is clear that she had prepared well.
  （彼女がよく準備していたのは明らかだ。）
• It is completely clear that we need more time.
  （もっと時間が必要なのは完全に明らかだ。）
• It is perfectly clear that they made a mistake.
  （彼らがミスをしたのは完全に明らかだ。）

obvious

• It is obvious that she is tired.
  （彼女が疲れているのは明白だ。）
• It is obvious that he didn’t try hard.
  （彼があまり努力しなかったのは明白だ。）
• It is quite obvious that they are late.
  （彼らが遅れているのはかなり明白だ。）
• It is very obvious that we failed.
  （私たちが失敗したのはとても明白だ。）

amazing

• It is amazing that he finished so quickly.
  （彼がそんなに早く終わらせたのは驚くべきことだ。）
• It is amazing that she has never traveled abroad.
  （彼女が一度も海外旅行をしたことがないのは驚くべきことだ。）
• It is truly amazing that they survived the storm.
  （彼らが嵐を生き延びたのは本当に驚くべきことだ。）
• It is absolutely amazing that you won the prize.
  （あなたが賞を取ったのは絶対に驚くべきことだ。）

surprising

• It is surprising that they agreed.
  （彼らが同意したのは驚くべきことだ。）
• It is surprising that he didn’t notice.
  （彼が気づかなかったのは驚くべきことだ。）
• It is rather surprising that she left early.
  （彼女が早く帰ったのはむしろ驚くべきことだ。）
• It is quite surprising that we won.
  （私たちが勝ったのはかなり驚くべきことだ。）

strange

• It is strange that he didn’t call.
  （彼が電話をかけてこなかったのは奇妙だ。）
• It is strange that they disappeared suddenly.
  （彼らが突然姿を消したのは奇妙だ。）
• It is very strange that she ignored us.
  （彼女が私たちを無視したのはとても奇妙だ。）
• It is quite strange that it’s so quiet.
  （こんなに静かなのはかなり奇妙だ。）

unfortunate

• It is unfortunate that she lost her job.
  （彼女が仕事失ったのは不幸なことだ。）
• It is unfortunate that he couldn’t join us.
  （彼が私たちと一緒に行けなかったのは不幸なことだ。）
• It is very unfortunate that it rained all day.
  （一日中雨が降ったのはとても不幸なことだ。）
• It is truly unfortunate that they canceled the event.
  （彼らがイベントを中止したのは本当に不幸なことだ。）

important

• It is important that we finish today.
  （今日これを終えるのが重要だ。）
• It is important that she understands the rules.
  （彼女がルールを理解するのが重要だ。）
• It is very important that he attends the meeting.
  （彼が会議に出席するのはとても重要だ。）
• It is extremely important that we stay focused.
  （私たちが集中し続けるのは極めて重要だ。）

necessary

• It is necessary that you attend.
  （あなたが会議に出席する必要がある。）
• It is necessary that we check the details.
  （私たちが詳細を確認する必要がある。）
• It is absolutely necessary that she signs the form.
  （彼女がフォームに署名するのは絶対に必要だ。）
• It is completely necessary that he calls us back.
  （彼が電話をかけ直すのは完全に必要だ。）

essential

書き言葉やフォーマルなスピーチで。

• It is essential that we act quickly.
  （迅速に行動することが不可欠だ。）
• It is essential that he has all the information.
  （彼がすべての情報を持つことが不可欠だ。）
• It is completely essential that you stay calm.
  （あなたが冷静でいることは完全に不可欠だ。）
• It is absolutely essential that they meet the deadline.
  （彼らが締め切りを守ることは絶対に不可欠だ。）

doubtful

書き言葉やフォーマルなスピーチで。

• It is doubtful that he will arrive on time.
  （彼が時間通りに着くのは疑わしい。）
• It is doubtful that she believed the story.
  （彼女がその話を信じたとは疑わしい。）
• It is highly doubtful that they will change their minds.
  （彼らが考えを変えるとは非常に疑わしい。）
• It is very doubtful that it happened by chance.
  （それが偶然に起こったとはとても疑わしい。）

unlikely

• It is unlikely that she will change her mind.
  （彼女が考えを変えるとは思えない。）
• It is unlikely that he forgot the promise.
  （彼が約束を忘れたとは思えない。）
• It is quite unlikely that they will win.
  （彼らが勝つとはかなり思えない。）
• It is very unlikely that it was an accident.
  （それが事故だったとはとても思えない。）
• It is hardly unlikely that she noticed.
  （彼女が気づいたとはほとんど思えない。）

evident

書き言葉やフォーマルなスピーチで。

• It is evident that they worked hard.
  （彼らが一生懸命働いたのは明白だ。）
• It is evident that she had practiced a lot.
  （彼女がたくさん練習していたのは明白だ。）
• It is quite evident that he is lying.
  （彼が嘘をついているのはかなり明白だ。）
• It is completely evident that we need help.
  （私たちに助けが必要なのは完全に明白だ。）

remarkable

書き言葉やフォーマルなスピーチで。

• It is remarkable that he survived.
  （彼が生き延びたのは注目すべきことだ。）
• It is remarkable that she learned so fast.
  （彼女がそんなに早く学んだのは注目すべきことだ。）
• It is truly remarkable that they built it in a day.
  （彼らが一日でそれを作ったのは本当に注目すべきことだ。）
• It is quite remarkable that you stayed so calm.
  （あなたがそんなに冷静でいられたのはかなり注目すべきことだ。）

funny

• It is funny that he forgot his birthday.
  （彼が自分の誕生日を忘れたのはおかしい。）
• It is funny that she didn’t laugh.
  （彼女が笑わなかったのはおかしい。）
• It is rather funny that they wore the same shirt.
  （彼らが同じシャツを着ていたのはむしろおかしい。）
• It is quite funny that he tripped again.
  （彼がまたつまずいたのはかなりおかしい。）

sad

• It is sad that they couldn’t come.
  （彼らが来られなかったのは悲しい。）
• It is sad that he has given up.
  （彼が諦めてしまったのは悲しい。）
• It is very sad that she lost her cat.
  （彼女が猫を失ったのはとても悲しい。）
• It is deeply sad that we missed the chance.
  （私たちがそのチャンスを逃したのは深く悲しい。）

natural

• It is natural that she feels nervous.
  （彼女が緊張するのは自然だ。）
• It is natural that he wants to rest.
  （彼が休みたいと思うのは自然だ。）
• It is quite natural that they disagreed.
  （彼らが意見を異にしたのはかなり自然だ。）
• It is perfectly natural that you’re tired.
  （あなたが疲れているのは完全に自然だ。）

reasonable

• It is reasonable that he asked for more time.
  （彼がもっと時間を求めたのは合理的だ。）
• It is reasonable that she refused.
  （彼女が断ったのは合理的だ。）
• It is perfectly reasonable that they complained.
  （彼らが文句を言ったのは完全に合理的だ。）
• It is quite reasonable that he felt upset.
  （彼が腹を立てたのはかなり合理的だ。）

fortunate

• It is fortunate that we found it early.
  （それが早く見つかったのは幸運なことだ。）
• It is fortunate that he wasn’t hurt.
  （彼が怪我をしなかったのは幸運なことだ。）
• It is very fortunate that she passed the test.
  （彼女がテストに合格したのはとても幸運なことだ。）
• It is truly fortunate that they escaped.
  （彼らが逃げられたのは本当に幸運なことだ。）

curious

• It is curious that he never talks about his past.
  （彼が過去について話さないのは興味深い。）
• It is curious that she chose that color.
  （彼女がその色を選んだのは興味深い。）
• It is rather curious that they arrived together.
  （彼らが一緒に着いたのはむしろ興味深い。）
• It is quite curious that it didn’t break.
  （それが壊れなかったのはかなり興味深い。）

critical

書き言葉やフォーマルなスピーチで。

• It is critical that we solve this now.
  （今この問題を解決することが決定的だ。）
• It is critical that he stays focused.
  （彼が集中し続けることが決定的だ。）
• It is absolutely critical that she arrives on time.
  （彼女が時間通りに着くのは絶対に決定的だ。）
• It is extremely critical that we act fast.
  （私たちが迅速に行動するのは極めて決定的だ。）

shocking

• It is shocking that he lied to everyone.
  （彼がみんなに嘘をついたのは衝撃的だ。）
• It is shocking that she quit suddenly.
  （彼女が突然辞めたのは衝撃的だ。）
• It is absolutely shocking that they lost everything.
  （彼らがすべてを失ったのは絶対に衝撃的だ。）
• It is quite shocking that he didn’t apologize.
  （彼が謝らなかったのはかなり衝撃的だ。）

ridiculous

• It is ridiculous that they expect us to finish by tomorrow.
  （明日までに終えることを期待するのはばかげている。）
• It is ridiculous that he blamed me.
  （彼が私を責めたのはばかげている。）
• It is utterly ridiculous that she believed that story.
  （彼女がその話を信じたのは全くばかげている。）
• It is completely ridiculous that they forgot again.
  （彼らがまた忘れたのは完全にばかげている。）

wonderful

• It is wonderful that you passed the exam.
  （あなたが試験に合格したのは素晴らしい。）
• It is wonderful that they helped us.
  （彼らが私たちを助けてくれたのは素晴らしい。）
• It is truly wonderful that she recovered so fast.
  （彼女がそんなに早く回復したのは本当に素晴らしい。）
• It is absolutely wonderful that we met again.
  （私たちがまた会えたのは絶対に素晴らしい。）

apparent

書き言葉やフォーマルなスピーチで。

• It is apparent that she doesn’t like him.
  （彼女が彼を好きじゃないのは明らかだ。）
• It is apparent that he had tried his best.
  （彼が最善を尽くしたのは明らかだ。）
• It is quite apparent that they are confused.
  （彼らが混乱しているのはかなり明らかだ。）
• It is completely apparent that we missed something.
  （私たちが何かを見逃したのは完全に明らかだ。）

unbelievable

• It is unbelievable that they climbed the mountain.
  （彼らが山に登ったのは信じられない。）
• It is unbelievable that she won first place.
  （彼女が1位を取ったのは信じられない。）
• It is absolutely unbelievable that he forgot his lines.
  （彼が台詞を忘れたのは絶対に信じられない。）
• It is completely unbelievable that they didn’t notice.
  （彼らが気づかなかったのは完全に信じられない。）

regrettable

書き言葉やフォーマルなスピーチで。

• It is regrettable that we couldn’t help.
  （彼らを助けられなかったのは残念だ。）
• It is regrettable that she missed the flight.
  （彼女が飛行機に乗り遅れたのは残念だ。）
• It is very regrettable that he lost his chance.
  （彼がそのチャンスを失ったのはとても残念だ。）
• It is deeply regrettable that they canceled it.
  （彼らがそれをキャンセルしたのは深く残念だ。）

3. 使えない形容詞

「It is + 形容詞 + that」構文は多くの形容詞で使えるけど、すべての形容詞が自然にフィットするわけじゃない。以下に、このパターンで使えない、または不自然になる形容詞の例を挙げるよ

感情を直接表す形容詞

happy, angry, sad などは「It is happy that…」のように使うと不自然。感情は通常、人や主体に結びつくから。

例: It is happy that she won.（不自然）→ She is happy that she won.（彼女が勝って嬉しい。）が正しい。

ただし、sad は状況を客観的に評価する文脈で例外的に使える（例: It is sad that he gave up.）。

具体的な性質を示す形容詞

tall, heavy, blue などは「It is tall that…」みたいに使えない。具体的な物や人にしか適用できないから。

例: It is tall that he grew up.（意味不明）→ He is tall.（彼は背が高い。）が自然。

動作や状態に特化した形容詞

running, sleeping のような動詞由来の形容詞もこの構文では変。

例: It is running that he escaped.（不自然）→ He was running when he escaped.（彼は逃げるとき走っていた。）が正しい。

この構文に合う形容詞は、状況や事実を評価・判断するもの（例: clear, likely, important）が中心。感情や具体的な特徴を表すものは避けるのが無難。

4. 口語での使用状況

よく使われる形容詞では自然

clear, obvious, true, likely, important みたいな日常的な形容詞は、口語でも使われる。特に「It’s obvious that…」とか「It’s true that…」。

• 例: It’s clear that he doesn’t get it.（彼が理解してないのは明らかだ。）
• 例: It’s likely that she’ll be late.（彼女が遅れる可能性が高いよ。）

“that” の省略が口語的

さらにカジュアルな会話では「that」を省いてしまうことが多い。特にスピード感のある会話だと自然だよ。

• 例: It’s obvious she’s tired.（彼女が疲れてるのは明白だ。）
• 例: It’s important we finish this.（これを終わらせることが大事だ。）

フォーマル寄りの形容詞は口語で減る

regrettable, essential, remarkable みたいなちょっと硬めの形容詞は、口語だとあまり出てこない。書き言葉やフォーマルなスピーチでよく見るけど、日常会話では簡略化される傾向がある。

• 例: It’s regrettable that we couldn’t help.（助けられなかったのは残念だ。）→ 口語だと “Too bad we couldn’t help.” とかになるかも。
• 例: It’s essential that you stay calm.（冷静でいることが不可欠だ。）→ 口語では “You’ve gotta stay calm.” の方が自然。

否定や強調の副詞

否定や強調のの副詞は口語でも使われる。感情を込めたいときや強調したいときに便利で、口語でも映える。

• 例: It’s hardly possible he did it alone.（彼が一人でやったなんてほとんどありえない。）
• 例: It’s never true he lied.（彼が嘘ついたなんて絶対ありえない。）

5. 例文集

訳なしの例文集、イメージしながら音読。

• It is possible that she knows the truth.
• It is possible that they missed the train yesterday.
• It is quite possible that he is still asleep.
• It is entirely possible that she forgot to call last night.
• It is hardly possible that he finished it alone.
• It is true that she loves chocolate.
• It is true that they have lived here for years.
• It is absolutely true that he saw the accident.
• It is completely true that we finished on time.
• It is never true that he lied to us.
• It is certain that they will win.
• It is certain that he knew the plan.
• It is quite certain that she will arrive late.
• It is absolutely certain that we made the right choice.
• It is likely that it will rain this afternoon.
• It is likely that she heard the news.
• It is very likely that he will agree.
• It is highly likely that they forgot the deadline.
• It is hardly likely that she will change her mind.
• It is clear that he didn’t understand.
• It is clear that she had prepared well.
• It is completely clear that we need more time.
• It is perfectly clear that they made a mistake.
• It is obvious that she is tired.
• It is obvious that he didn’t try hard.
• It is quite obvious that they are late.
• It is very obvious that we failed.
• It is amazing that he finished so quickly.
• It is amazing that she has never traveled abroad.
• It is truly amazing that they survived the storm.
• It is absolutely amazing that you won the prize.
• It is surprising that they agreed.
• It is surprising that he didn’t notice.
• It is rather surprising that she left early.
• It is quite surprising that we won.
• It is strange that he didn’t call.
• It is strange that they disappeared suddenly.
• It is very strange that she ignored us.
• It is quite strange that it’s so quiet.
• It is unfortunate that she lost her job.
• It is unfortunate that he couldn’t join us.
• It is very unfortunate that it rained all day.
• It is truly unfortunate that they canceled the event.
• It is important that we finish today.
• It is important that she understands the rules.
• It is very important that he attends the meeting.
• It is extremely important that we stay focused.
• It is necessary that you attend.
• It is necessary that we check the details.
• It is absolutely necessary that she signs the form.
• It is completely necessary that he calls us back.
• It is essential that we act quickly.
• It is essential that he has all the information.
• It is completely essential that you stay calm.
• It is absolutely essential that they meet the deadline.
• It is doubtful that he will arrive on time.
• It is doubtful that she believed the story.
• It is highly doubtful that they will change their minds.
• It is very doubtful that it happened by chance.
• It is unlikely that she will change her mind.
• It is unlikely that he forgot the promise.
• It is quite unlikely that they will win.
• It is very unlikely that it was an accident.
• It is hardly unlikely that she noticed.
• It is evident that they worked hard.
• It is evident that she had practiced a lot.
• It is quite evident that he is lying.
• It is completely evident that we need help.
• It is remarkable that he survived.
• It is remarkable that she learned so fast.
• It is truly remarkable that they built it in a day.
• It is quite remarkable that you stayed so calm.
• It is funny that he forgot his birthday.
• It is funny that she didn’t laugh.
• It is rather funny that they wore the same shirt.
• It is quite funny that he tripped again.
• It is sad that they couldn’t come.
• It is sad that he has given up.
• It is very sad that she lost her cat.
• It is deeply sad that we missed the chance.
• It is natural that she feels nervous.
• It is natural that he wants to rest.
• It is quite natural that they disagreed.
• It is perfectly natural that you’re tired.
• It is reasonable that he asked for more time.
• It is reasonable that she refused.
• It is perfectly reasonable that they complained.
• It is quite reasonable that he felt upset.
• It is fortunate that we found it early.
• It is fortunate that he wasn’t hurt.
• It is very fortunate that she passed the test.
• It is truly fortunate that they escaped.
• It is curious that he never talks about his past.
• It is curious that she chose that color.
• It is rather curious that they arrived together.
• It is quite curious that it didn’t break.
• It is critical that we solve this now.
• It is critical that he stays focused.
• It is absolutely critical that she arrives on time.
• It is extremely critical that we act fast.
• It is shocking that he lied to everyone.
• It is shocking that she quit suddenly.
• It is absolutely shocking that they lost everything.
• It is quite shocking that he didn’t apologize.
• It is ridiculous that they expect us to finish by tomorrow.
• It is ridiculous that he blamed me.
• It is utterly ridiculous that she believed that story.
• It is completely ridiculous that they forgot again.
• It is wonderful that you passed the exam.
• It is wonderful that they helped us.
• It is truly wonderful that she recovered so fast.
• It is absolutely wonderful that we met again.
• It is apparent that she doesn’t like him.
• It is apparent that he had tried his best.
• It is quite apparent that they are confused.
• It is completely apparent that we missed something.
• It is unbelievable that they climbed the mountain.
• It is unbelievable that she won first place.
• It is absolutely unbelievable that he forgot his lines.
• It is completely unbelievable that they didn’t notice.
• It is regrettable that we couldn’t help.
• It is regrettable that she missed the flight.
• It is very regrettable that he lost his chance.
• It is deeply regrettable that they canceled it.