时态的特殊句式.doc

时态的特殊句式1. was/were about to do “正要做某事正在这时突然另一件事发生了” was/were doing }+when 主语+did… had done “刚做完某事正在这时突然另一件事发生了” eg:I was about to go out when the telephone rang.=I was at the point of going out when the telephone rang.2.This/That/It is the …time that 主语 have/has done… This/That/It is the …time that 主语 have/has done…Eg:It was the third time that he had come to this mountain village to see the children.3.Hardly/Scarcely/rarely had 主语 done… when 主语+ did… No sooner主语 done… than 主语+ did… “刚做某事，另一件事发生了”Eg:I had hardly got home when the rain poured down.=Hardly had I got home when the rain poured down.4.It is/has been 段时间 since 主语 +did/现在完成时 It was/had been 段时间 since 主语 +过去完成时“自从某事发生已有多久”Eg: It is/has been 3 years since he lived there.(延续性动词表从动作结束时算起) It is/has been 3 years since he joined the party.5.It will be段时间 before 主语 +do(es)…“过了多久才做sth” It was段时间 before 主语 +did…It won’t be段时间 before 主语 +do(es)… It wasn’t 段时间 before 主语 +did…“没过了多久就做sth”6.by the time 从句用一般现在时，主句用将来完成时; by the time 从句用一般过去时，主句用过去完成时。

Eg:By the time this letter reaches, you will have left the country.7.since从句用一般过去时，主句用现在完成(进行)时Eg: She has been living a hard life since she became addicted to drugs.I haven't heard from him since last year. She left school three years ago and has worked as a nurse ever since.。