(1) It takes / took / will take sb. some time / money to do sth.

     某人花/花了/将花多长时间/多少钱做某事.

例：It took me years of hard work to speak good English.

        为了讲一口流利的英语,我花了多年时间刻苦操练.

(2) It is + adj +for/of sb to do sth

例：Lincoln said that it was not right for the South to break away from the Union. 

林肯说南方脱离联邦是不对的。

It was careless of Tom to break the cup.

(3) Sb. have / has / had no choice but to do... 某人除了做……别无选择.

例：We had no choice but to take a taxi for we'd missed the last bus.

         由于错过了最后一班公共汽车,除了乘坐的士,我们别无选择.

(4) It's not /just like sb. to do sth  ------的行为不/正像某人的一贯作风.

例：lt's not like Jim to be late for class. He regards time as the most important thing in life.  

        上课迟到不像吉姆的一贯作风,他把时间看作是生命中最重要的.

(5)  --- 形容词／副词＋enough to do sth．

例：I was fortunate enough to travel to South Africa.．

(6) It pays to + V  （---是值得的。） 

例：It pays to help others. 帮助别人是值得的。　　

(7) It cost sb some time/money to do sth

例：It must cost a good deal to live here.住这儿一定会花很多钱的。

(8) do all he could to do sth = do what he could to do sth = do everything he could to do sth

例：They were doing everything they could to help the fatherland.

         他们在尽最大努力去帮助祖国。

(9) It is hard to imagine/ say …   很难想象/说……

例：It is hard to imagine how Edison managed to work twenty hours each day. 

很难想象爱迪生每天是怎样工作20小时的。

        It's hard to say whether the plan is practical. 这个计划是否实际很难说。