句型1：It+be+adj.(for sb./of sb.)to do
It is difficult(for me)to learn Russian.(我)学俄语是件困难的事。
It is very kind of you to help me.你帮助我真是太好了。
句型2：It +be +adj.+that
It is true that he went there.他去了那儿，是真的。
句型3：It +be +time +for +n.
It +be +time(for sb.)+to do
It's time for class.该上课了。
It's time(for us)to go to school.(我们)该上学了。
It's seven now.现在七点了。
It's winter now.现在是冬季。
It's sunny today.今天阳光灿烂。
It's twenty miles to London.这里离伦敦有20英里。
句型5：It's one's turn(to do)
It's your turn to speak.轮到你发言了。
句型6：It +takes/took+sb.+some time +to do
It took me two hours to finish the work.我用了两小时完成这项工作。
句型7：It seems that...
It seems that he has been ill for a long time.他好像病了很长时间。
句型8：It +costs +sb.+some money +to do
It cost me 1，000 yuan to buy that bike.买那辆自行车我用了1000元。
句型9：It +be +some time +since...
It is three years since he came here.他自来这儿以来，已经三年了。
句型10：It +be +quite +a(an)+adj.+n.
It's quite a nice book.它是一本相当好的书。