完成时什么时候用
2个回答
现在完成时用法
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.
