延续性动词与非延续性动词
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。

一.延续性动词表示能够延续的动作,如：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等。

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:
1.for+一段时间, eg: for 2 years; for a long time等
2.since从句,since he came here;
3.since+时间点+ago,eg：since last year, since 5 days ago;
4. how long;
二.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。

如:open, die, close, begin, finish, come, go, move, borrow, lend, buy等。

如果要与for+ 时间段，since+年份，since+时间段+ago，how long连用时，瞬间性动词要变延续性动词。

三.延续性动词与非延续性动词之间的转换：
例：（1）他死了三年了。

误：He has died for three years.
正：He has been dead for three years.
正：He died three years ago.
正：It is three years since he died.
正：Three years has passed since he died.
(2) 他来这儿五天了。

误：He has come here for five days.
正：He has been here for five days.
正：He came here five days ago.
正：It is five days since he came here.
正：Five days has passed since he came here. (1)、(2)句中的die、come为终止性动词，不能与表示"段时间"的状语连用。

那么，应如何正确表达呢？可以采用下面的四种方法：
(1)将句中终止性动词转换为相应的延续性动词, 如上面两例中的第一种正确表达方式.
(2)将句中表示"段时间"的状语改为表示过去确定时间的状语，如下面两例中的第二种正确表达
方式。

(3)用句型"It is+段时间+since..."表达原意，如上面两例中的第三种正确表达方式。

(4)用句型"时间+has passed+since..."表达原意，如上面两例中的第四种正确表达方式。

四、终止性动词可用于现在完成时否定式中，成为可以延续的状态，因而可与表示一段时间的
状语连用。

如:1.He hasn't left here since 1986.
2.I haven't heard from my father for two weeks.
五、终止性动词的否定式与until/till连用，构成"not+终止性动词+until/till ..."的句型，意为"
直到……才……"。

如：1. You can't leave here until I arrive.直到我到了，你才能离开这里。

2. I will not go to bed until I finish drawing the picture tonight.今天晚上直到我画完画，我才
上床睡觉。

六、终止性动词可以用于when引导的时间状语从句中，但不可以用于while引导的时间状
语从句中。

when表示的时间是"点时间"(从句谓语动词用终止性动词)，也可以是"段时间"(从句谓语动词用延续性动词)。

而while表示的是一个较长的时间或过程，从句谓语动词用延续性动词。

如：1. When we reached London, it was twelve o'clock. (reach为终止性动词)
2. Please look after my daughter while/when we are away. (be away为延续性动词短语)
七、终止性动词完成时不可与how long连用(只限于肯定式)。

如:误：How long have you come here?
正：How long have you been here? 正：When did you come here?
补充练习：
1.When he arrived at the bus stop, the bus ___ for 20 minutes.
A. has left
B. had left
C. has been away
D. had been away
2. I _____ the League for 5 years so far.
A. joined
B. have joined
C. have been in
3.The factory _____since the February of 1988.
A . has been open B. has opened C. was open D. opened
4. Mary and Rose _______friends since they met in 2000.
A. have made
B. have been
C. made
D. have become
5.You mustn't ____until he comes back.
A. be away
B. leave
C. be left
6.The meeting _______ for a week now.
A. has finished
B. has ended
C. has been over
7.Miss Gao ______ this school for nearly 5 years.
A. has been in
B. has come to
C. has taught
8.Ben ______ a teacher for 4 years .
A. has been
B. has become
C. was
D. became
9. I ______ home for a week.
A. have returned
B. have been back
C. returned
10. How long _______ he ________ ?
A. died
B. has, died . has, been dead
11.He_____at eight yesterday afternoon.
A. slept
B. was sleeping
C. has sleep
D. had slept
12.He ________ the car for a week.
A. bought
B. has bought
C. has had
13.-----How long _____ you _____ ill ? -----Two weeks.
A. did fall
B. have, fell
C. have, been
14.Since 2000, he _____ his hometown.
A. has left
B. has moved away
C. has been away from
15.I'll lend you the book , but you can only ____ it for 2 days.
A. borrow
B. keep
C. take
16.The bus ______ on the road for 2 hours so far.
A. has stopped
B. stopped
C. has been
17.Are you _____ the jacket these days?
A. wearing
B. putting on
C. dressing
D. on
18. He ________ foe 2 hours.
A. got up
B. has got up
C. has been up
19. Tom is ill in hospital. He _______ a cold for several days.
A. is
B. catches
C. has caught
D. has had
20. ----- How long can I ______ the book? ------ Two weeks.
A. borrow
B. lend
C. get
D. keep
1---5 D C A B B; 6---10 C A A B C; 11---15 B C C C B; 16---20 C A C D D。