It is understood that ....
…だと聞いて［決まって］いる
It is unfortunate (that) ....
残念なことに…である
It is unlike him to be late for an appointment.
約束に遅れるなんて彼らしくない
It is unnecessary for him to be here.
彼がここにいる必要はない
It is unusual for him to be late.
彼が遅れることは珍しい
It is useless trying [to try] to reason with them.
彼らを説得しようとしてもむだだ
It is usual for him to be late.
彼が遅刻するのはふつうのことだ
It is very dangerous to smoke in bed.
寝タバコは危険だ
It is very generous of you to do ....
…して下さるとはお礼の言葉もありません
It is very irresponsible of him not to answer my letter.
ぼくの手紙に返事をくれないとは彼はまったくいいかげんだ
