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。
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;
否定的终止性动词可以与表示时间段的时间状语连用。
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.
例：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
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 mustn't ________ until he comes back.
A. be away
B. leave
C. be left
meeting _______ for a week now.
A. has finished
B. has ended
C. has been over
Gao ______ this school for nearly 5 years.
A. has been in
B. has come to
C. has taught
______ 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 ________ the car for a week.
A. bought
B. has bought
C. has had
long _____ you _____ ill -----Two weeks.
A. did fall
B. have, fell
C. have, been
2000, he _____ his hometown.
A. has left
B. has moved away
C. has been away from
'll lend you the book , but you can only _____ it for 2 days.
A. borrow
B. keep
C. take
bus ______ on the road for 2 hours so far.
A. has stopped
B. stopped
C. has been
you _____ the jacket these days
A. wearing
B. putting on
C. dressing
D. on
________ 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
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
动词概述 一、实义动词 ■①及物动词与不及物动词 根据后面是否带宾语，行为动词又可分为及物动词和不及物动词，及物动词。Vt. vi . They study hard. I know them well. 注：有的动词既可作及物动词，也可用作不及物动词。如： She sings very well. She sang an English song just now. 英语里有不少实义动词可以兼作及物动词和不及物动词。兼作及物动词和不及物动词时，____不变。试比较： Shall I begin at once? She began working as a librarian after she left school. When did they leave Chicago?They left last week. 短语： ■②动态动词和静态动词 动态动词表示动作，如give, take, work, run等；静态动词表示感觉、情感、内心世界、相互关系等，如know, exist, be, have, appear, prove, concern, hate, dislike, like, love, surprise, include, depend on, belong to, guess, suppose，imagine, believe, doubt, admire, envy等。 ■③延续性动词和非延续性动词 根据动作是否延续，行为动词又分为延续性动词和非延续性动词。如rain, live, work, learn等是延续性动词，go, come, leave, start, arrive, join, finish, end等是非延续性动词。 注：非延续性动词在肯定句中通常不与表示时间段连用的for短语连用。如：[译]他离开这里三天了。 [误]He has left here for three days. [正]He has been away from here for three days. [正]He left here three days ago. [正]It’s three days since he left. ■④限定动词与非限定动词
现在完成时练习题（短暂性动词与延续性动词的转换） 一.单项选择 （）1. Li Hong has ________ the army for 2 years. A. joined B. be in C. been in D. joined in （）2. Mike ___________ the story for a month. A. has bought B. has had C. had had D. has borrowed （）3. Mr. Black _________ China since the summer of 1998. A. has been to B. has been in C. has come to D. came to （）4. His father _______ for years. A. has died B. has been dead C. died D. dies （）5. He has a computer of his own. He ____ it two days ago A. bought B. bought C. bought D. has bought （）6. --- Is your father a Party member? --- Yes, he ____ the party three years ago. He _____ a Party member for three years. A. joined; has been B. has joined; has been C. was joined; is D. joined; was （）7. ---What a nice bike! How lone ____ you ____ it? ----Just five weeks. A. will; buy B. did; buy C. are; having D. have; had （）8. I ______ this book for a week .I have to return it now. A. borrowed B. have borrowed C. kept D. have kept （）9. ----______ your sister _______ in Green China for a long time? ----Yes. She joined it five years ago. A. Has; been B. Have; been C. Has; joined D. Have; joined （）10. ---How long have you _______ from the USA? ----For three months. A. come back B. returned C. go back D. been back （）11. I _____ this book for half a year. A. have bought B. have had C. bought D. had
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
延续性动词与短暂性动词的用法英语中的动词，是学习中的重点，又是难点。英语中的动词有多种分类法。根据其有无含义，动词可分为实义动词和助动词；根据动词所表示的是动作还是状态，可以分为行为动词和状态动词；根据动词所表示的动作能否延缓，分为延续性动词和终止性动词。 可以表示持续的行为或状态的动词，叫做“延续性动词”，也叫“持续性动词”，如：be, keep, have, like, study, live, etc. 有的表示短暂、瞬间性的动词，叫做“终止性动词”，也可叫“短暂性动词”，或“瞬间性动词”，如die, join, leave, become, return, reach, etc. 终止性动词构成的现在完成时，不可以用表示一段时间的状语（如：since 和for引导的短语）来修饰，终止性动词构成的现在完成时，只表示动作发生的因果关系，不能表示动作的延续，因此不能用表示一段时间的状语来修饰。 如可以说：The Red Cross has already started for the earthquake-stric ken area. 但不可说：The Red Cross has already started for the earthquake-stric ken area for three days. 因为start是终止性动词, 它所表示的动作短促, 当红十字会出发时，start 这个动作便结束了, 不可能延续两天。 在多年的教学生涯中，发现学生对于如何解决这对矛盾不知所措，下面我来归纳一下解决这对矛盾的四种方法。 1. 用ago时间状语短语来代替since或for引导的时间状语： eg. Mr. Richard has returned from America for two years. (wrong) Mr. Richard has returned from America since two years ago. (wrong) 应改为: He returned from America two years ago. 2．用It is… since…复合句代替简单句 eg. It has been/is two years since Mr. Richard returned from Americ a. 注意：以上两种办法适用于所有终止性动词。 3．用相应的形容词和副词代替终止性动词。 eg. Mr. Richard has been back from America for two years. 4．用延缓性动词代替终止性动词。 eg. He has gone to the Internet for six hours. (wrong) 应改为:He has been on the Internet for six hours. 但须注意：终止性动词的否定式可以和since 或for 引导的时间状语连用。因为终止性动词的否定表示的是一种可以延续的状态。 eg. I have heard from my friend in Africa for half a year. (wrong) I haven’t heard from my friend in Africa for half a year.. (right) 此外，终止性动词与延缓性动词在翻译上也不同，很易混淆。下面我再就终止性动词与延缓性动词的含义问题做一归纳：
中考英语短暂性动词与延续性动词相互转换讲练 中考英语短暂性动词与延续性动词相互转换对应表 语法讲解： 1.现在完成时表示过去发生的某一动作或存在的状态，一直持续到现在，并可以和以 for或since引导的表示一段时间的状语连用，也可以用在以“how long”提问的句子中，句子中的谓语动词一般为延续性动词。例： He has been away from Beijing for two years. = He left Beijing two years ago. When did the train arrive here? B. How long ____ the train ____ here? 2.在现在完成时的肯定句中，非延续性动词作谓语动词时，不能和表示一段时间的状语连用。但可以用其他句式来表示同一个意思。例： Lucy has come back. The old man died 4 years ago. = The old man has been dead for 4 years.
He has been away from Beijing for two years. = He left Beijing two years ago. = It is two years since he left Beijing. = Two years has passed since he left Beijing. 3.非延续性动词可以在现在完成时的否定句中作谓语，并可以与for，since引导的时间状语连用，表示动作的延续过程。例如： She h asn’t bought any new clothes since last year. I haven’t borrowed the book for a long time. 巩固习题： 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.The meeting _______ for a week now. A. has finished B. has ended C. has been over 6.Miss Gao ______ this school for nearly 5 years. A. has been in B. has come to C. has taught 7.Ben ______ a teacher for 4 years . A. has been B. has become C. was D. became 8. I ______ home for a week. A. have returned B. have been back C. returned 9. How long _______ he ________ ? A. died B. has, died C. has, been dead 10. ----- How long can I ______ the book? ------ Two weeks. A. borrow B. lend C. get D. keep 11.He ________ the car for a week. A. bought B. has bought C. has had 12.-----How long _____ you _____ ill ? -----Two weeks. A. did fall B. have, fell C. have, been 13.Since 2000, he _____ his hometown. A. has left B. has moved away C. has been away from 14.I'll lend you the book , but you can only _____ it for 2 days. A. borrow B. keep C. take 15.The bus ______ on the road for 2 hours so far. A. has stopped B. stopped C. has been
短暂性动词与延续性动词在现在完成时中的用法 英语中的动词有多种分类法。根据其有无含义，动词可分为实义动词和助动词；根据动词所表示的是动作还是状态，可以分为行为动词和状态动词；根据动词所表示的动作能否延缓，分为延续性动词和终止性动词。英语中，按动词延续的时间长短，可将动词分为延续性动词和短暂性动词。延续性动词如learn, study, work, play, wait，have,,live,teach,keep,like 等。短暂性动词是非延续性动词，即动作一开始便结束的动词，又可称结束性动词，瞬间动词，如leave, begin, start, return, arrive, reach, die, marry, bear, see, hear, receive, buy, get, enter, take off, start off, come in, come back, take place, break out, put on, put down, go in 等。 终止性动词构成的现在完成时，不可以用表示一段时间的状语（如：since 和for引导的短语）来修饰，终止性动词构成的现在
完成时，只表示动作发生的因果关系，不能表示动作的延续，因此不能用表示一段时间的状语来修饰。 如可以说：The Red Cross has already started for the earthquake-stricken area. 但不可说：The Red Cross has already started for the earthquake-stricken area for three days. 因为start是终止性动词, 它所表示的动作短促, 当红十字会出发时，start这个动作便结束了, 不可能延续两天。 1. 用ago时间状语短语来代替since或for引导的时间状语： eg. Mr. Richard has returned from America for two years. (wrong) Mr. Richard has returned from America since two years ago. (wrong) 应改为: He returned from America two years ago. 2．用It is… since…复合句代替简单句
中考英语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 不能与时间段连用。如:open, die, close, begin, finish, e, go, move, borrow, lend, buy等。 如果要与时间段连用，就把它转为延续性动词使用。 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. 但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---be open, close--- be closed fall ill --- be ill, get up---be up, catch a cold --- have a cold, e here --- be here, go there --- be there, be e --- be, e back --- be back, fall asleep --- be asleep, get to/ arrive/reach --- be (in), leave --- be away, go (get) out →be out，put on→wear get married ---- be married 等。 例:The old man died 4 years ago. ----The old man has been dead for 4 years. 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 be e 5.You mustn't ________ until he es 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 e to C. has taught 8.Ben ______ a teacher for 4 years .
1.d ied—have/hasb een dead 2.b ought—have/has had 3.b orrowed—have/has kept 4.b egan—have/has been on 5.o pened-have/has been open 6.c losed —have/has been closed 7.l eft? --have/has been away from? 8.c ame here —have/has been here 9.m oved to? --have/has lived in.. 10.w ent to? --have/has been in? 11.j oined? --have/has been in?. /have/has beena member of? 12.m arried sb/got married to sb—have/has been married to sb 13.f inished –have/has been over
14.m ade/became friends —have/has been friends 15.b egan to teach —have/has taught 16.l ose (lost—) haven'/h t asn't had 17.b ecome (became—) have/has been * He went to London in 1990. He is still in London now. He has been in Londons ince 1990. * I borrowed the book two weeks ago. I have kept the book for two weeks/sincet wo weeks ago. It is two weekss ince I borrowed the book. He joined the League two years ago. = It is two years since he
延续性动词与非延续性动词练习题 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.
初中英语点动词和延续性动词练习题 初中英语点动词和延续性动词练习题初中英语点动词和延续性动词练习题 w 初中英语点动词和延续性动词练习题 1) He got to Beijing five minutes ago He ________ _________ _________ Beijing for _________ _________ 2) I moved to the USA last year I ________ ________ __________ the USA since __________ __________ 3) I went home yesterday I _______ ________ _________ home for _________ __________ 4) They came here last week They _________ _________ here since _________ __________ 5) He came out two years ago He _________ __________ _________ for __________ __________ 6) We return to Fuzhou yesterday We ________ ________ _________ to Fuzhou since __________ 7) I became a teacher in 2000 I ________ __________ a teacher for _________ _________ 8) The river became dirty last year The river _________ _________ dirty for _________ __________ 9) The shop closed two hours ago The shop ________ _________ _________ for _________ _________
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"
持续动词与瞬间动词 英语的行为动词有持续性动词和瞬间性动词之分，使用中应注意两者的区别。 持续性动词表示一个动作可持续一段时间，此类动词有do, live, have, keep, wear, sleep, wait, work, play, stay, know, sing, dance, write, study, rest, talk, walk等. 瞬时性动词表示不能持续的动作，这种动作发生后立即结束，此类动词有open, close, finish, begin, come, go, arrive, reach, leave, move, borrow, buy, die, lend, join, catch, get, win, fail等 一、持续性动词 表示一个动作可以持续一段时间或更长时间。常见的有study, play, do, read, learn, drive, write, clean, slean, sleep, speak, talk, wait, fly, stay, write, sit, stand, lie, keep等。 二、瞬间性动词 表示一个动作发生在一瞬间，非常短暂。亦称终止性动词。常见的有begin, start, finish, go, come, leave, find, get up, arrive, reach, get to, enter, hear, stop, open, close, become, buy, borrow, lend, happen, join, lose, renew, die, take away, put up, set out, put on, get on/off等。 以上已集中了初中教材的大部分持续性动词及瞬间性动词。 三、用法 1、持续性动词在完成时中能与表示持续一段时间的状语连用，而瞬间性动词则不能。例如：His parents talked with the teacher for half an hour.（他的父母跟老师谈了半个小时。） My mother has lain in bed for 3 days.（我母亲生病卧床已经三天了。） My parents have lived in Shanghai since 1950.（我父母亲从1950年起就住在上海了。） 2、瞬间性动词在完成时中如要与表示持续一段时间的状语连用，通常的方法： （1）用意思相当的持续性动词来替换，例如： He has been in the army/a soldier for htree years.（他参军已有3年了。）不能用has joined She has been up for quite some time.（她起床已有好久了。）不能用has got up Has your brother been away from home for a long time?（你哥哥离家已有好久了吗？）不能用has left 初中课本中的常用瞬间动词相应持续性动词关系如下： 1、go——be away 2、come——be here 3、come back——be back 4、leave——be away（be not here） 5、buy——have 6、borrow——keep 7、die——be dead 8、begin——be on 9、finish——be over 10、open——be open 11、close——be closed 12、lose——be lost 13、get to know——know 14、turn on——be on 15、get up——be up 16、sit down——sit/be seated 17、join——be in（…）或be a…member a)用延续性动词代替终止性动词 1、用have代替buy My brother has had(不能用has bought) this bike for almost four years. 2、用keep或have代替borrow I have kept(不能用have borrowed) the book for quite a few days. 3、用be替代become How long has your sister been a teacher? 4、用have a cold代替catch a cold
when和while引导的时间状语从句与这一时态连用。所以区别when和while的用法成了这一单元的难点。（一）、when，while都有“当……时候”的意思。when既可表示某一点时间，也可以表示某一段时间。在when引导的时间状语从句中，其谓语动词可以是延续性的，也可以是非延续性的，可与主句中的谓语动词同时发生，也可在其后发生。例如： 1、I was just reading a book when she came into my room. 她走进我房间时，我正在看书。 2、Were you writing when the teacher came in? 老师进来的时候，你在写信吗？ 3、When he was a child he was always trying out new ideas. 他小时候就常常试验一些新的设想。（二）、while只能表示某一段时间，不能表示某一点时间。在while引导的时间状语从句中，其谓语动词只能是延续性的，而且也只能与主句中的谓语动词同时发生或存在。例如：1、While Jim was mending his bike, Lin Tao came to see him. 正当吉姆修自行车时，林涛来看他。 2、You can’t do your homework while you’re watching TV. 你不能一边看电视一边做家庭作业。（三）、另外，when和while的区别还在于：while引导的时间状语从句多用进行时态，而when引导的时间状语从句多用一般时态。例如： 1、While they were talking , the bell rang. 正在他们谈话的时候，上课铃响了。 2、I was doing my homework when my mother came back home yesterday evening. 昨天晚上妈妈回家的时候 一、延续性动词和终止性动词的概念 英语中，动词按其动作发生的方式、动作发生过程的长短，可分为延续性动词和终止性动词。 延续性动词表示能够延续的动作，这种动作可以延续下去或产生持久影响。如：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay 等。 终止性动词也称非延续性动词、瞬间动词或短暂性动词，表示不能延续的动作，这种动作发生后立即结束。如open, close, finish, begin, come, go, arrive, reach, get to, leave, move, borrow,buy等。 二、延续性动词的用法特征 1.延续性动词可以用于现在完成时，其完成时态可与表示"段时间"的状语连用。表示"段时间"的短语有：for two years, during the past three years, since last year, how long 等。如：I have learned English since I came here.自从我来到这儿就学英语了。 2.延续性动词不能与表示短暂时间的"点时间"状语连用。如：It raind at eight yesterday morning.(误) rain为延续性动词，而at eight表示"点时间"，前后显然矛盾。如果用延续性动词表示一瞬间的动作，可以借助come, begin, get等终止性动词来表示。上句可改为：It began to rain at eight yesterday morning.(正)又如： -When did you get to know Jack? -Two years ago.