延续性动词与非延续性动词及其转换
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:for+一段时间,for 2 years; since从句,since he came here; since+时间点名词,since last year, since 5 days ago; how long; for a long time等。

例:He has lived here for 6 years. You can keep the book for 5 days. I stayed there for 2 weeks last year. How long did you stay there last year?
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。

非延续性动词在肯定句中与表示时间点的状语连用，如：two years ago; at 5 o'clock;
例:He died 5 years ago.
否定的终止性动词可以与表示时间段的时间状语连用。

例:I haven't left here for 3 years.
I haven't heard from him for 3 weeks.
三.延续性动词与非延续性动词之间的转换：leave --- be away, borrow --- keep, buy --- have, begin/start --- be on, die --- be dead, finish --- be over, join --- be in+组织机构, be a member of+组织机构, open sth --- keep sth open, fall ill --- be ill, get up---be up, catch a cold --- have a cold, come here --- be here, go there --- be there, become --- be, come back --- be back, fall asleep --- be asleep, get to/ arrive/reach --- be (in), leave --- be away from, get to know --- know, go (get) out →be out，put on→wear；catch a cold →have a cold 等。

例:The old man died 4 years ago. ----The old man has been dead for 4 years. ---- It is 4 years since the old man died. ----Four years has passed since the old man died. He joined the Party 2 years ago. -----He has been in the
Party for 2 years. I bought the book 5 days ago. ---- I have had the book for 5 days.
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
C. 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
Key:
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。