现在完成时 have∕has + P.P.
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…”（后面跟一点时间）for（后面跟一段时间）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…（已经回来了）
have∕has gone to…去了…（还没回来）
I have been to Shanghai.
Tom has gone to Shanghai.
⑴单数第三人称：
肯：S.三 + has + P.P. +…
否：S.三 + has not (hasn’t) + P.P. +…
肯疑：Has + S.三 + P.P. +…?
Yes, S.三 + has.
No, S.三 + hasn’t.
否疑：Hasn’t + S.三 + P.P. +…?
Yes, S.三 + has.
No, S.三 + hasn’t.
⑵其他人称：
肯：S. + have + P.P. …
否：S. + have not ( haven’t ) + P.P. …
肯疑：Have + S. + P.P. …?
Yes, S. + have.
No, S. + haven’t.
否疑：Haven’t + S. + P.P. …?
Yes, S. + have.
No, S. + haven’t.
过去完成时 had + P.P.
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. By the end of last year , I had lived here for 20 years .
⑵ 动作在过去的某一时间已经完成.
He had finished his homework before his mother came in .
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. Tom said that he had been to about 30 countries .
肯：S. + had + P.P. +…
否：S. + had not (hadn’t )+ P.P. +…
肯疑：Had + S.+P.P. +…?
Yes, S. + had.
No, S. + hadn’t.
否疑：Hadn’t + S. + P.P. +…?
Yes, S. + had.
No, S. + hadn’t.
现在完成进行时 have∕has + been + V-ing
⑴表示从过去开始一直持续到在,这个动作可能刚刚结束,也可能还要持续下去,这种时态动作是连续的,没有中断过.
I have been teaching for about 10 years .
He has been smoking for 30 years .
⑵表示一直到说话为止的一段时间内一再重复的动作.
What have you been doing these years ?
⑶表示一直到说话为止的一段时间内,大部分时间都在持续进行的动作（不一定持续到说话的时候）往往暗示这个动作对现在的影响.
I have been working in that bank for 5 years .
肯：S. + have∕has + been + V-ing…
否：S.+ haven’t ∕hasn’t + been + V-ing…
肯疑：Have∕Has + S. + been + V-ing…?
Yes, S.+ have∕has
No, S. + haven’t ∕hasn’t
否疑：Haven’t ∕Hasn’t + S. + been + V-ing…?
Yes, S.+ have∕has
No, S.+ haven’t ∕hasn’t
