It's unlike him to be late.他可不是迟到的那种人。
It will take the works over a year to build the fly-over 建造这座立交桥将花费工人们一年多的时间
It would be wrong for people to marry for money.人们为钱而结婚是错误的。（It+be+形容词+for短语+不定式）
It's a shame to say like that.那样说话是可耻的。（It+be+名词+不定式）
It is against may principles to do such a thing.做这样的事是违反我的原则的。（It+be+介词短语+不定式）
（1）It is certain that he will win the match.
（2）It is true that he has made a very important discovery in chemistry.
（3）It is very likely that they will hold a meeting.
（4）It is strange that he should do that.
（5）It is important that we all should attend the meeting.
（6）It is strange that the man should have stuck to his silly ideas.