动词时态（Tense）
I.
四．过去将来(would/should do)
He said he would help us.
I told her I should return the book in a few days.
II
现在完成时用法注意
Join/die/leave/marry不和for+段时间连用
判断正误
He has joined the army for 4 years.()
He has been in the army for 4 years.
He joined the army 4 years ago.
It is/has been 4 years since he joined the army.
They have got married for 4 years.
They have been married for 4 years.
III． 用法区别
1. did/have done
1) I have read the book.(I know the story.)
I read the book last year.(just a fact)
2) I have taught here since 2010. (I am teaching here.)
I taught here in 1989. (Probably I no longer teach here.)
2. did/ was/were doing
What did you do last night?
What were you doing at seven lat night?
2. have done/have been doing
He has been reading the book.(强调持续性)
He has read the book.（强调结果对现在的影响）
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