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现在完成时
一 构成 have∕has + P.P.
二 用法
⑴ 与just连用,表示刚刚完成的动作或状态（just放在have∕has与P.P.之间）.
I have just had lunch.
He has just finished his homework.
⑵ 表示动作发生在过去,持续到现在,有可能延续到将来,常与since“自从…”
（一点时间）for（一段时间）连用.
I have learned English since 2000.
He has lived there for 10 years.
⑶ 表示过去的动作对现在的影响.
He has lost his key.
⑷ 与最高级连用,表示“到目前为止最…”
You’re the cleverest girl that I’ve seen.
⑸ 与It∕This the first time that…连用,表示“第一次……”
It∕This is the first time that he has learned English.
⑹ have∕has been to…曾经去过…（已归）
have∕has gone to…去了…（未归）
I have been to Shanghai.
Tom has gone to Shanghai.
过去完成池
一 构成 had + P.P.
二 用法
⑴ 动作发生在过去的某一时间之前,持续到过去的这一 点,有可能延续到将来.
I had lived here before I knew him .
⑵ 动作在过去的某一时间已经完成.
I had finished my homework before you came back .
⑶ 动作常用于间接引语中,表示某事在我们过去所谈话或者所思考的时间以前已经发生了.
He told us that he had been to America .
一 构成 have∕has + P.P.
二 用法
⑴ 与just连用,表示刚刚完成的动作或状态（just放在have∕has与P.P.之间）.
I have just had lunch.
He has just finished his homework.
⑵ 表示动作发生在过去,持续到现在,有可能延续到将来,常与since“自从…”
（一点时间）for（一段时间）连用.
I have learned English since 2000.
He has lived there for 10 years.
⑶ 表示过去的动作对现在的影响.
He has lost his key.
⑷ 与最高级连用,表示“到目前为止最…”
You’re the cleverest girl that I’ve seen.
⑸ 与It∕This the first time that…连用,表示“第一次……”
It∕This is the first time that he has learned English.
⑹ have∕has been to…曾经去过…（已归）
have∕has gone to…去了…（未归）
I have been to Shanghai.
Tom has gone to Shanghai.
过去完成池
一 构成 had + P.P.
二 用法
⑴ 动作发生在过去的某一时间之前,持续到过去的这一 点,有可能延续到将来.
I had lived here before I knew him .
⑵ 动作在过去的某一时间已经完成.
I had finished my homework before you came back .
⑶ 动作常用于间接引语中,表示某事在我们过去所谈话或者所思考的时间以前已经发生了.
He told us that he had been to America .
1年前
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