(1)It is time for sb. to do sth. 该是某人做某事的时候了。

　　It is time for us ______________(have) a rest.

　　(2)It is (high/about) time that sb. did / should do sth. 是该做某事了(从句中用虚拟语气)

　　It is high time that I _______________(go) to fetch my daughter.

　　(3)It is the first/ second/ third etc. time that sb. have done sth. 某人第几次做某事

　　It is the fourth time that she___________________( ring) you in a week.

　　拓展：it的基本用法

　　（1）用作人称代词，代替前文提到过的事物。

　　The train has arrived. It arrived half an hour ago.

　　（2）用以代替提示代词this, that。

　　-What's this? -It's a knife.

　　-Whose watch is that? -It's mine.

　　（3）起指示代词的作用，指一个人或事物。

　　-Who is knocking at the door? -It's me.

　　（4）指环境情况等。

　　It was very noisy (quiet) at the very moment.

　　（5）指时间、季节等。

　　-What time is it? -It's eight o'clock.

　　It often rains in summer here.

　　（6）指距离。

　　It is a long way to the school.

　　（7）作形式主语。

　　It is not easy to finish the work in two days.

　　（8）作形式宾语。

　　I found it very interesting to study English.

　　（9）用于强调结构。

　　It was Xiao Ming whom(that)I met in the street last night.

　2. It is only when the disease has progressed to AIDS that a person begins to look sick.

　　只有当这种疾病发展成艾滋病时，人才会显现出病态。

　　本句中含有It is ...that...强调句型， 强调了when引导的时间状语。

　　It is all the members ______________ held a meeting in the club yesterday.

　　It was in the bathroom _____________ Joe found his wallet.

　　It was three years ago _______________ that I first met him.

　　考点例题：

　　1) It was ___________ he said ___________ disappointed me.

　　A. what; that B. that; that C. what; what D. that; what

　　2) I hate _____ when people talk with their mouths full.

　　A. it B. that C. these D. then

　　3)--He nearly died from cancer once?

　　--When was ________?

　　--__________ was in 2000 when he was in middle school.

　　A. that ; It B. this; This C. this ; It D. that; This

　　4) 用it进行句型转换， 意思不变

　　a. To keep order in an important football match is a hard job for the police. =

　　_______________________________________ for the police to keep order in an important football match.

　　b. Who will take us to visit the nature park hasn't been decided yet. =

　　________________________________________ who will take us to visit the nature park.

　　c. I spend two hours writing the essay. =

　　________________________________________ to write the essay.

　　d. They seem to be quarrelling about something.

　　________________________________________ they are quarrelling about something.

【模拟试题】

（一）用框内所给词组的适当形式完成下列句子。