It is 形容詞 that S V — 形容詞パターン完全ガイド

that○

to do×

that 節のみ（to do 不可）

命題の真偽・可能性・状況の性質など、客観的評価をする形容詞。to 不定詞とは組み合わせられません。

🔍 真偽・明白性

true³⁸²⁷ obvious¹⁰³⁸ evident⁶⁹⁷ apparent⁵⁵⁴ certain²⁵⁴ undeniable¹³² well-known⁶³ plain⁵⁵ unclear⁴⁵ indisputable³⁰ self-evident²⁹

○ It is obvious that he lied.

× It is obvious for him to lie.

🎲 可能性・蓋然性

likely²³²³ unlikely¹³⁵³ doubtful³⁴⁴ conceivable³⁴² probable³¹⁷ inevitable²¹⁴ plausible¹⁴⁷ inconceivable¹¹⁶ rare¹⁰⁶ impossible¹⁰² arguable⁸⁴

○ It is likely that he will come.

× It is likely for him to come.

※ He is likely to come. のように人主語なら可

💭 状況の客観評価

unfortunate⁴¹³ noteworthy⁴⁰⁰ ironic³¹¹ regrettable⁴² fortunate³⁴ tragic²⁹

○ It is ironic that he won.

× It is ironic for him to win.

that○

to do○

両方 OK

重要性・感情・妥当性など、感情的評価をする形容詞。that 節も to 不定詞も使えます。

⚡ 重要性・必要性

important¹⁹⁹³ imperative⁸⁶⁶ essential⁶⁶⁸ critical⁴³⁴ vital²⁸¹ crucial²⁴⁵ necessary²¹⁸ better⁹¹ desirable⁴¹ paramount²⁸ urgent²⁶

○ It is important that he attend the meeting.

○ It is important for him to attend the meeting.

※ that 節では仮定法現在（should）を伴うことが多い

🎯 possible（例外）

possible³⁸⁰³

○ It is possible that he will fail.

○ It is possible for him to fail.

※ 可能性系で唯一 to do も可

💭 状況の感情評価

interesting⁶⁵¹ significant³¹⁰ sad²³³ remarkable¹⁹⁴ notable¹⁹¹ surprising¹⁷⁵ amazing¹⁶⁵ good¹⁴⁹ great⁹³ encouraging⁷¹ unsurprising⁵⁷ disappointing⁵² wonderful⁴⁹ astonishing⁴¹ ridiculous³⁸ shameful³⁷ funny³⁵ unthinkable³⁵ nice³² outrageous³² unbelievable²⁹ shocking²⁹ unacceptable²⁴

○ It is surprising that he passed.

○ It is surprising for him to pass.

⚖️ 適切性・妥当性

understandable²¹⁹ natural⁸¹ strange⁶⁵ curious⁶⁴ appropriate⁶¹ odd⁵¹ well⁴⁰ logical³⁹ reasonable²⁸

○ It is natural that he feel angry.

○ It is natural for him to feel angry.

that×

to do○

to do のみ（that 節不可）

以下のカテゴリの形容詞は that 節を取りません：有効性・効率性・難易度・利便性

🎯 有効性

effective useful helpful beneficial

× It is effective that you study every day.

○ It is effective for you to study every day.

⚡ 効率性

efficient productive

× It is efficient that we use AI.

○ It is efficient for us to use AI.

📊 難易度

easy difficult hard simple

× It is difficult that he solves this.

○ It is difficult for him to solve this.

🔧 利便性

convenient handy

× It is convenient that you visit me.

○ It is convenient for you to visit me.

名詞

It is 名詞 that S V（補足）

形容詞と同様の評価機能を持つ名詞表現。ただし決まり文句であり、類推は効きません。★ = 必須

😢 残念・遺憾

a shame²⁴⁰ a pity⁷⁶ a tragedy¹⁹ a travesty¹⁴ a disgrace⁹ a scandal⁶

○ It is a pity that he can't come.

= It is unfortunate that he can't come.

🤷 当然・驚くに当たらない

no surprise³⁵⁶ no wonder³¹³ no coincidence²⁷⁹ no accident²³⁵ no secret¹⁶⁹

○ It is no wonder that he quit.

= It is unsurprising that he quit.

※ no doubt は There is no doubt that が普通

📜 真偽・信憑性

a fact³⁰¹ a myth⁴⁹ a reality²⁷ a truism¹⁵ a certainty⁹ a misconception⁸

○ It is a fact that the earth is round.

= It is true that the earth is round.

✨ 驚き・奇跡

a wonder²⁵ a miracle²² a coincidence¹² a paradox⁶ a surprise⁵

○ It is a miracle that he survived.

= It is miraculous that he survived.

⚠️ 問題・脅威

a problem⁷³ a threat⁸ a mistake⁷ a crisis⁵

○ It is a problem that he never listens.

💡 ポイント：形容詞と違い生産的ではありません。上記リストがほぼ全てで、ここにない名詞（a sadness, a difficulty など）は使えません。