英語語法小竅門:如何辨別英語時(shí)態(tài)
一、根據(jù)時(shí)間狀語與時(shí)態(tài)的對(duì)應(yīng)關(guān)系 動(dòng)詞特定的時(shí)態(tài)常常與特定的時(shí)間狀語聯(lián)系在一起,如由this time yesterday可知用過去進(jìn)行時(shí);由so far, in the past three years, till now可知要用完成時(shí),等等。
1、句中含有yesterday; last year(last + 具體時(shí)間); two days ago(一段時(shí)間 + ago); just now; this morning; in 2008(in + 過去的年代); the other day; over the weekend等時(shí)間狀語時(shí),謂語動(dòng)詞用一般過去時(shí);
2、句中含有tomorrow; next week(next +具體時(shí)間); in two hours(in +一段時(shí)間); (how) soon; from now on; 10 years from now(一段時(shí)間+from now); in the future; in 2012(in +將來的年代); by (the end of) next month(by+將來時(shí)間); for the weekend; this afternoon; this evening; tonight; this weekend等時(shí)間狀語時(shí),謂語動(dòng)詞用一般將來時(shí);
3、句中既有yesterday等過去時(shí)間狀語,又有一個(gè)具體時(shí)間點(diǎn)(at 5:00; this time; at that time)時(shí),謂語動(dòng)詞用過去進(jìn)行時(shí);
4、句中含有recently; in the last/past two years(in the last/past+一段時(shí)間); over the years(over the+一段時(shí)間); since 2005(since+具體時(shí)間或從句); for two years(for+一段時(shí)間,句中無其它時(shí)間狀語); before(單獨(dú)用于句尾)等時(shí)間狀語時(shí),謂語動(dòng)詞用現(xiàn)在完成時(shí);
5、by (the end of) last year(by+過去時(shí)間); two days before(一段時(shí)間+before); for和since說明的時(shí)間同時(shí)用于句中;by the time + 從句(過去時(shí)態(tài))等時(shí)間狀語時(shí),謂語動(dòng)詞用過去完成時(shí);
6、簡單句中如不含上述時(shí)間狀語或有含說話時(shí)間在內(nèi)的表示現(xiàn)在時(shí)間關(guān)系的詞語時(shí)(如now; today; these days等詞)解析:由時(shí)間狀語at this time tomorrow可知用將來進(jìn)行時(shí),故選B。
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二、固定句型與動(dòng)詞時(shí)態(tài)間的對(duì)應(yīng)關(guān)系 在英語中,不少句型與一些動(dòng)詞在時(shí)態(tài)的運(yùn)用方面都存在著特定的對(duì)應(yīng)關(guān)系,
1.在“祈使句+and/or+陳述句”句型中,陳述句中用will表示的一般將來時(shí);
2.在This/如That/It is t he second time that…句型中用現(xiàn)在完成時(shí),若is改為was,就用過去完成時(shí);
3.在no soon er…than…和hardly…when…句型中,前面常用過去完成時(shí),when/than后的句子用一般過去時(shí);
about to do…when…或was/were doing…when…或was/were on the point of doing…when…句型中,when分句的謂語動(dòng)詞用一般過時(shí);
5.在一個(gè)含有時(shí)間狀語從句的主從復(fù)合句中,如果主從句的謂語動(dòng)詞都是過去發(fā)生的動(dòng)作,一般來說,表示短暫性動(dòng)作的動(dòng)詞用一般過去時(shí),表示持續(xù)性動(dòng)作的動(dòng)詞用過去進(jìn)行時(shí);等等。
Let’s keep to the point or we _______ any decisions.
A. will never reach B. have never reached C. never reach D. never reached
解析:這是“祈使句+or +陳述句”句型,陳述句的謂語要用“will+動(dòng)詞原形”,故選A。
三、根據(jù)某些動(dòng)詞與時(shí)態(tài)的對(duì)應(yīng)關(guān)系 在英語里有些動(dòng)詞與時(shí)態(tài)有著特定的對(duì)應(yīng)關(guān)系,如see(看見),hear(聽見),find(找到) 等都不可用于進(jìn)行時(shí)態(tài);work表示機(jī)器不能正常運(yùn)行、運(yùn)轉(zhuǎn)時(shí),常用一般現(xiàn)在時(shí)的否定式;open, close, lock等詞表示門、窗等不能正常關(guān)、開、鎖的意思時(shí),常用won’t open /close /lock等,這時(shí)它們是以主動(dòng)形式表示被動(dòng)意義。
—Can I help you, sir? —Yes. I bought this radio here yesterday, but it _____.
work B. won’t work C. can’t work D. doesn’t work 解析:此處的work是指radio不能正常運(yùn)行,應(yīng)用一般現(xiàn)在時(shí)的否定式,故選D。
四、根據(jù)上下語境來確定時(shí)態(tài) 在絕大多數(shù)情況下,動(dòng)詞的時(shí)態(tài)是由上下文來決定的,這就要求我們一方面要熟記各種時(shí)態(tài)的適用范圍,另一方面要求我們注意上下文的提示。
— Is this raincoat yours? — No, mine ______ there behind the door.
hanging B. has hung C. hangs D. hung
解析:根據(jù)上下文的提示,hang表示的是目前的狀態(tài),故選A。
五、主從句時(shí)態(tài)的一致性原則:主從復(fù)合句可根據(jù)其時(shí)態(tài)一致性原則,通過主從句中任意一個(gè)句子的時(shí)態(tài)確定另外一個(gè)句子的時(shí)態(tài);含有時(shí)間狀語從句的主從句還可通過其引導(dǎo)詞所表示的不同時(shí)間關(guān)系,確定主句和從句的時(shí)態(tài)。
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時(shí)態(tài)練習(xí)題:
( )1. What _____ you _____ over the weekend?
A. will; do B. does; do C. did; do D. were,; doing
( )2. Xiao Li usually _____ to school by bike last year.
A. goes B. went C. will go D. is going
( )3. What _____ in our town 100 years from now?
A. happened B. is happened C. has happened D. will happen
( )4. Mr. Smith _____ to see you in an hour.
A. came B. has come C. will come D. comes
( )5. _____ you _____ from your parents recently?
A. Did; hear B. Have; heard C. Do; hear D. Will; hear
( )6. We _____ TV at home this time last night.
A. were watching B. watched C. have watched D. would watch
( )7. We _____ over 1500 English words by the end of last month.
A. have learned B. had learned C. will learn D. learnt ( )
8. She _____ in Shanghai for ten years since 1992.
A. has lived B. had lived C. lived D. will live
( )9. She _____ in Shanghai for ten years. A. has lived B. had lived C. lived D. will live
( )10. We all know that the earth _____ round the sun.
A. goes B. went C. is going D. will go
( )11. “Where are the boys?” “They _____ soccer on the playground.”
A. play B. are playing C. were playing D. played
( )12. Look! Lucy _____ under the tree. A. reads B. is reading C. was reading D. read
( )13. He _____ more than 200 model cars in the last five years.
A. has collected B. had collected C. collected D. will collect