在英語中,不同時(shí)間里發(fā)生的動(dòng)作或存在的狀態(tài),謂語動(dòng)詞要用不同的形式來表示,謂語動(dòng)詞的這種不同形式稱為動(dòng)詞的時(shí)態(tài)。
英語中有8種基本時(shí)態(tài),其中4種現(xiàn)在時(shí)態(tài),對(duì)應(yīng)4種過去時(shí)態(tài)。4種現(xiàn)在時(shí)態(tài)是:一般現(xiàn)在時(shí)態(tài);現(xiàn)在進(jìn)行時(shí)態(tài);一般將來時(shí)態(tài);現(xiàn)在完成時(shí)態(tài)。他們對(duì)應(yīng)的4種過去時(shí)態(tài)是:一般過去時(shí)態(tài);過去進(jìn)行時(shí)態(tài);過去將來時(shí)態(tài);過去完成時(shí)態(tài)。
在含有從句的復(fù)合句中,主從句的時(shí)態(tài)要求遵循一定的規(guī)則,既保持協(xié)調(diào),又相互照應(yīng)。
1.主句和賓語從句的時(shí)態(tài)呼應(yīng)
(1)在含有賓語從句的復(fù)合句中,主句是現(xiàn)在時(shí)態(tài)或?qū)頃r(shí)態(tài)時(shí),賓語從句的謂語動(dòng)詞可用所需要的任何適當(dāng)?shù)臅r(shí)態(tài)。如:
I think Tom is ill today.我認(rèn)為湯姆病了。(主句一般現(xiàn)在時(shí),從句一般現(xiàn)在時(shí))
I think Tom has gone to the doctor's.我認(rèn)為湯姆已經(jīng)去看醫(yī)生了。(主句一般現(xiàn)在時(shí),從句現(xiàn)在完成時(shí))
I think Tom went to the doctor's yesterday.我認(rèn)為湯姆昨天去看醫(yī)生了。(主句一般現(xiàn)在時(shí),從句一般過去時(shí))
(2)當(dāng)主句的謂語動(dòng)詞是過去時(shí),賓語從句中的謂語動(dòng)詞也要用過去的某種時(shí)態(tài)。如:
Mr.Smith told me that he would come to our school.史密斯先生告訴我他要來我們學(xué)校。(主句一般過去時(shí),從句過去將來時(shí))
Mr.Smith told me that he didn't know the news.史密斯先生告訴我他不知道那個(gè)消息。(主句一般過去時(shí),從句一般過去時(shí))
Mr.Smith told me that he had known the news already.史密斯先生告訴我他已經(jīng)知道那個(gè)消息了。(主句一般過去時(shí),從句過去完成時(shí))
注意:
如果從句敘述的是客觀真理或不可改變的事實(shí),雖然主句用了過去時(shí)態(tài),但從句仍用一般現(xiàn)在時(shí)。如:Mr.Smith told me that children under 18 in his country cannot buy alcohol.史密斯先生告訴我在他的國家18歲以下的孩子不能買酒。
2.主句與狀語從句的時(shí)態(tài)呼應(yīng)
在含有時(shí)間狀語從句和條件狀語從句的復(fù)合句中,從句用一般現(xiàn)在時(shí),主句要用一般將來時(shí),祈使句或含有情態(tài)動(dòng)詞的句子。如:
You'll make progress if you keep working hard.如果你繼續(xù)努力你就會(huì)取得進(jìn)步。
Don't get off the bus until it has stopped.直到車停穩(wěn)再下車。
3.主句與定語從句的時(shí)態(tài)呼應(yīng)
在含有定語從句的復(fù)合句中,主句的時(shí)態(tài)有時(shí)也決定從句的時(shí)態(tài)。如果主句的時(shí)態(tài)是現(xiàn)在時(shí)態(tài),從句可根據(jù)實(shí)際需要確定時(shí)態(tài),如果主句用了過去時(shí)態(tài),定語從句一般也用過去時(shí)態(tài)。如:
This is the person I met yesterday.這就是昨天我遇見的那個(gè)人。
This is the person who will give us a lecture tomorrow.這就是明天要給我們作報(bào)告的那個(gè)人。
This was the person who would give us a lecture the next day.這就是第二天要給我們作報(bào)告的那個(gè)人。
【中考速遞】
1.[上海中考考題] This medicine _____ millions of people's lives since it was put into use.
A.is saving B.will save C.has saved D.had saved
2.[北京中考考題] — Where did you go last weekend?
— I _____ to the Great Wall.
A.go B.went C.will go D.have gone
3.[云南昆明中考考題] Look!A dog _____ a blind man across the road.
A.leads B.lead C.is leading D.led
4.[吉林中考考題] Steve _____ TV in the living room when his mother came in.
A.was watching B.watches C.is watching
5.[河南中考考題] Everyone wants to reach the top of the mountain,but all the happiness happens while you _____ it.
A.climb B.climbed C.are climbing D.have climbed
6.[山東濟(jì)南中考考題] — Does Jimmy still work as a driver?
— No.He has _____ for two years.
A.left the company B.gone to Shanghai
C.studied in college D.lost his job
7.[河北中考考題] Just go down this road and you _____ the library next to the bank.
A.see B.saw C.have seen D.will see
8.[湖北武漢中考考題] — Sorry,Tom.I can't find the book you _____ me.
— It's OK.I don't need it any more.
A.lend B.have lent C.will lend D.lent
【答案點(diǎn)撥】
1.答案:C 句意:自從這款藥品投入使用以來,它挽救了許許多多人的生命。由時(shí)間狀語since it was put into use可知,句子用現(xiàn)在完成時(shí),故選C。
2.答案:B 句意:“你上周去哪了?”“我去長城了”由last weekend 可知句中的謂語動(dòng)詞用一般過去時(shí)。故選 B。
3.答案:C 句意:看!一只狗正帶領(lǐng)著一個(gè)盲人過馬路。由句首的Look可知句子用現(xiàn)在進(jìn)行時(shí),故選C。
4.答案:A 句意:當(dāng)媽媽進(jìn)來時(shí),Steve正在起居室看電視。When引導(dǎo)時(shí)間狀語從句用一般過去時(shí),主句用過去進(jìn)行時(shí)。故選A。
5.答案:C 句意:每個(gè)人都想到達(dá)山頂,但所有的快樂都發(fā)生于你在攀爬的過程中。while引導(dǎo)的時(shí)間狀語從句用進(jìn)行時(shí),故選C。
6.答案:C 句意:“吉米仍然是一名司機(jī)嗎?”“不。他已經(jīng)在大學(xué)里學(xué)習(xí)兩年了?!庇蒮or two years可知用完成時(shí),動(dòng)詞要用延續(xù)性動(dòng)詞。故選C。
7.答案:D 句意:沿著這條街走,緊挨著銀行你會(huì)就看到圖書館。在“祈使句+and+陳述句”結(jié)構(gòu)中,陳述句要用將來時(shí),故選D。
8.答案:D 句意:“真抱歉,湯姆,我找不到你借給我的那本書了?!薄皼]關(guān)系,我不再需要它了?!庇删湟饪芍?,“你借給我的那本書”是過去發(fā)生的事情,用一般過去時(shí)。故選D。
【語法專練 體驗(yàn)中考】
1.[云南考題] — Can John play soccer with us,Mrs.Black?
— One moment,please.He _____ on the phone to his cousin.
A.talks B.talked C.talking D.is talking
2.[山東濟(jì)南] Sun Hai _____ his mother make dinner when his father got home from work.
A.was helping B.helps C.helped D.is helping
3.[廣東考題] School violence(暴力)_____ much attention of the whole society and people are calling the government to make laws against it as early as possible.
A.drew B.will draw C.has drawn D.was drawing
4.[湖北武漢] — Who is that lady?
— She's Miss Green.She _____ us music,and she is so good.
A.taught B.teaches C.will teach D.is teaching
5.[呼和浩特] — I have to be off right now.
— What a pity!I _____ you could stay a little longer with us.
A.thought B.am thinking C.think D.have thought
6.[江西考題] The water _____ dark and dirty.It's no longer safe to drink.
A.become B.has become C.will become D.was become
7.[青??碱}] — It's a great pity that the famous football player has gone to another club.
— Don't worry!They _____ another top star recently.
A.buy B.bought C.have bought
8.[黑龍江哈爾濱] — Could you tell me where you found Miss Gao just now?
— Certainly.In the principal's office.They _____ happily at that time.
A.are talking B.have talked C.were talking
9.[江蘇鎮(zhèn)江] The engineers _____ a new computer in our classroom the whole yesterday morning,so we had our classes in the school hall.
A.were fixing B.fixed C.have fixed D.are fixing
10.[湖北荊州] — Are you going to watch “Running Man” tonight?
— No!I _____ it with my parents only once.I don't think it's exciting.
A.see B.have seen C.will see D.am seeing
11.[遼寧沈陽] I think it is true that Jill _____ to work today because she is on a trip.
A.has come B.didn't come C.is coming D.will not come
12.[湖南張家界] — _____ you ever _____ the history museum,Paul?
— No,I haven't.
A.Do;visit B.Did;visit C.Have;visited
13.[湖北黃岡] — Where are you going,Bob?
— To go hiking.Eric _____ for me at the school gate!
A.was waiting B.waits C.waited D.is waiting
14.[江西考題] — May I speak to Mrs.Black?
— Sorry,Mum can't come to the phone now.She _____ a shower.
A.has B.had C.is having D.was having
15.[湖北黃石] Many scientists believe that robots _____ able to talk like humans in 50 years.
A.were B.are C.will be D.have been
16.[天津考題] — What a nice watch!How long _____ you _____ it?
— For just two weeks.
A.will;buy B.have;had
C.were;having D.did;buy
【答案速遞】
1.D 2.A 3.C 4.B 5.A 6.B 7.C 8.C 9.A 10.B 11.D 12.C 13.D 14.C 15.C 16.B
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