It is frightening to think that he could be my boss.
彼が上司になるかもしれないと思うとぞっとする
It is futile to try to do so.
そうしようとしてもむだだ
It is generally agreed that pollution should be reduced.
汚染改善の一般的な合意がある
It is getting dark.
暗くなってきた
It is good practice to make backup copies.
バックアップを取っておくことはよい習慣だ
It is hard living [to live] in that city.
その町は住みにくい
It is hard to do two things at once.
１度に２つのことをするのは難しい
It is hardly possible that I can get there by six.
６時までにそこに着くのは不可能に近い
It is held to be good for the health.
それは健康によいと考えられている
It is highly desirable that you (should) get there by tomorrow.
明日までにそこに着くのが大変望ましい
It is highly improbable that she will marry him.
彼女が彼と結婚するなんてとうていありえない
It is highly unlikely that such an accident could occur.
そのような事故が起こることはとうていありえない
It is hopeless to continue trying to convince him.
彼に納得させようとし続けてもむだだ
It is I.
それは私です（◆((略式))では通例It's me. 詠嘆の表現などでもIの代わりにmeが用いられる：Dear m...
It is illegal to discriminate on the basis [grounds] of sex.
性差別は違法だ
It is illegal to do ...
…することは不法である
It is immediately obvious that ....
…ということはただちに明らかとなる
It is imperative 「that you (should) attend [for you to attend] the meeting.
その会議には必ず出席するように
It is important for him to do it.
彼がそれをやるのは重要だ（◆意味上の主語はforで示す）
It is important that exceptions (should) not be made.
例外を設けないことが大事だ
It is important to distinguish good from evil.
善悪のけじめをつけることが肝要だ
It is important 「for us to know [that we (should) know] the full truth.
我々にとって肝心なのは事実の全容を知ることだ
It is impossible of realization.
それは実現不可能だ
It is in your (best) interest(s) to study hard.
猛勉強が（一番）君のためだ
It is inconceivable that ...
…であるとはとても信じられない
It is incredible that he can't do that.
彼がそれをできないとは信じられない
It is incumbent on you to advise him.
彼に忠告するのは君の義務だ
It is interesting that no one noticed that mistake.
だれもその間違いに気づかなかったとはおもしろい
It is interesting to see ...
…を見るのはおもしろい
It is invisible to the naked eye.
それは裸眼では見えない
It is irrational to believe in magic.
魔術を信じるなんてばかげている
It is just 10 o'clock.
いまちょうど１０時です
It is just on six.
ちょうど６時です
It is kind of you to do ....
…してくださってありがとう
It is legitimate to ....
…するのも当然だ
It is little less than bribery.
収賄同然だ
It is mandatory to wear a seat belt.
シートベルトの着用は義務である
It is manifest at a glance.
一目瞭然りょうぜんだ
It is morning, for the birds are singing.
朝だ，鳥が鳴いているもの
It is most irregular that he should have done such a thing.
彼がそんなことをしたのはまったく異例なことだ
It is my belief that we should accept the proposal.
私の意見ではその提案を受け入れるべきだ
It is my custom to rise early.
早起きは私の習慣だ
It is my dream [My dream is] to become a doctor.
夢は医者になることだ
It is my job (to do).
（…するのは）私の務めだ
It is my own fault entirely.
まったく私自身の責任だ
It is my proud boast that ....
…が私の自慢だ
It is necessary for there to be some check on the activities of Government.
政府の活動を監視することは必要だ
It is necessary that he (should) go there.
彼がそこへ行く必要がある（◆...he goes...と直説法にするときもある）
It is necessary that he should know the answer.
彼がその答えを知っていることが必要だ（((略式))It is necessary for him to know ...
It is never too late to mend.
((諺))悔い改めるのに遅すぎることはない
