it is a long story說來話長；一言難盡
It is a pity that 遺憾的是
it is asserted that有人斷言；有人主張
it is assumed that假定；人們認為；據(jù)推測
it is certain that毫無疑問……；肯定……
It is considered that據(jù)知
it is important這非常重要 it is important for sb to do：對某人來說做某事重要
It is important that ...：重要的是
It is learned that據(jù)悉…；眾所周知
It is no use doing：做.是沒用的
it is obvious that顯然…
It is raining下雨了
it is reported that據(jù)報道
It is said that：據(jù)說；有人說,；據(jù)說……
It is suggested that ...：建議,有人建議
It is supposed that...：據(jù)推測,人們猜測
it is the same with亦復(fù)如是
it is time to do sth.：是時候做什么事情了；是該做某事的時候了
it is time for sb to do：該是做某事的時候了