it指代时间的句型有： (1)It is time for sth. / (for sb.) to do sth. / that­从句(should do/ did，必须用虚拟语气)，如：(5)。 (2)It is /has been ＋ some time ＋ since­从句 (从句用一般过去时)

　　此句型中，若从句的谓语为非持续性动词，句意为“自从……以来已有多长时间了”；若从句的谓语为持续性动词，句意为“有多长时间没有做……了”，如：(6)、(7)。 (3)It / This is the first /second…time that­从句(必须使用现在完成时)句意为“某人第……次做了某事”，如：(8)。 (4)It was ＋时间点 ＋ when­从句，句意为“当……时，已经是……时间了”，如：(9)。 (5)It was / will be ＋ some time ＋ before­从句，句意为“过了……时间才……”；其否定句It wasn't / won't be ＋ some time ＋ before­从句，句意为“没过……时间就……”，如：(10)、(11)。 2．it作非人称代词的用法 (1) It is good for you to take part in social activities. (2) It looks as if he is ill.

　　(3) It happened that Mary was there too. (4) It seems that he is right.

　　(5) How did it come about that so many people were attacked? (6) Mobile phones make it possible for us to keep in touch anywhere. 2．it作非人称代词的用法 (7) I consider it no good chatting with strangers through the Internet. (8) I really find it a pity that you didn't come to the party. (9) I hate it when people speak with their mouths full. (10) I really appreciate it if you could help me with my math. (11) You can depend upon it that we won't give up. (12) It was Edison who invented the lamp. 2．it作非人称代词的用法 (13) It is I that am going to be sent there. (14) He didn't go to bed until_he_finished_his_homework. → It wasn't until he finished his homework that he went to bed.

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