现在完成时的延续性动词与非延续性动词

1. 动词按其动作发生的方式、发生过程的长短可分为延续性动词与非延续性动

词（短暂性动词或瞬间动词）。

延续性动词可以与表示时间段的状语连用。表示时间段的短语有: ⑴ for+

一段时间，如: for 2 years; ⑵ since从句, 如 since he came h ere; since+过去时间点，如 since last year, since 5 days ago。

非延续性动词也称终止性动词、瞬间动词, 表示不能延续的动作,这种动作发生后立即结束。在现在完成时的肯定句中，短暂性动词不能与表示时间段的

for短语，since短语或从句连用。也不能与表示时间段的how long引起的疑问句连用。

例如：(1) I have bought the book for 2 weeks. ( x )

I have bought the book. (√)

I have bought the book since two weeks ago. ( x )

I have bought the book two weeks ago. ( x )

I have had the book for two weeks. (√)

(2) The old man died 4 years ago.

=The old man has been dead for 4 years.

It is/has been 4 years since the old man died.

Four years has passed since the old man died.

2. 短暂性动词与延续性动词的转换：

(1) go (to)/ come (to)/arrive/get to/reach/move---be in/at become---be

return/go back/come back---be back

例如：He arrived in Beijing ten minutes ago.