狀語從句中的時態(tài)對應(yīng)

1、主句謂語動詞為現(xiàn)在時態(tài)，則從句動詞可根據(jù)需要使用任何時態(tài);主句謂語動詞為過去時態(tài)，從句的時態(tài)一般是過去范疇的時態(tài)，其中有如下幾種情況要注意:1.當(dāng)從句的動作與主句的動作同時發(fā)生，從句中一般用一般過去時或過去進(jìn)行時。2.3.從句的動作發(fā)生在主句動作之后，從句時態(tài)用過去將來時。從句的動作發(fā)生在主句動作之前，從句時態(tài)用過去完成時。主將從現(xiàn)原則在if，unless等詞引導(dǎo)的條件狀語從句;在 when, till/until，as soon as before，after，as, while，each time, the moment等詞引導(dǎo)的時間狀語從句；在 no matter + wh-，howev

2、er，whatever，whenever, even if/even though, so long as, on condition that等引導(dǎo)的讓步狀語從句 中，若主句為一般將來時（或包含情態(tài)動詞/祈使句），從句謂語動詞常用一般現(xiàn)在時表示將來;若主句為過去將來時，從句謂語動詞通常用一般過去時態(tài)代替過去將來時態(tài)e.g. I will call you as soon as she arrives.當(dāng)她來的時候，我就打電話給你。If it clears up, we will go to the park.如果天晴的話，我們就去公園。I will not let them in, whoe

3、ver they are.不管他們是誰，我都不會讓他們進(jìn)來。（2008 全國n, 14）If their marketi ng plans succeed, theytheir sales by 20 p erce nt.A. will in creaseB. have bee n in creas ing C. have in creased D. would be in creas ing特定引導(dǎo)詞及句式的時態(tài) I . sincesince引導(dǎo)的時間狀語 從句為一般過去時，主句中的時態(tài)用現(xiàn)在完成時或現(xiàn)在完成進(jìn)行時。e.g. Jenny has had ano ther babsi nee

4、I saw her last.從上次我見到Jenny以來，她又生了一個孩子。I have bee n lear ning En glishs ince I was in Grade 3.自從上二年級以來，我一直在學(xué)英語。The girl told her father she had bee n ills ince she came home.那個女孩告訴她父親，自從回到家她就一直在生病。Note: It + be + 一段時間+ since 中，若主句為一般現(xiàn)在時或現(xiàn)在完成時，從句常用一般過去時；如果主句為一般過去時，從句則常用過去完成時。e.g. It is more tha n thre

5、e years nowince I saw her last.自此我上次見到她，我們已有三年多沒見面了。It has bee n three years ince I was in Beiji ng.我不在北京已經(jīng)三年了。(1988全國)They asked me to have a drink with them. I said that it was at least ten years since Ia good drink.D. had bee n enjoyingA. had enjo yedB. was enjoying C. enjo yedn. beforebefore引導(dǎo)的時

6、間狀語 從句若是過去時，主句可用一般過去時或過去完成時。e.g. He closed the doorbefore he left the classroom.他在離開教室之前關(guān)上了門。We had bee n to four citiesbefore he came to join us.他來加入我們之前我們已經(jīng)去了四個城市了。Note: before的常用句型It will (wo n't) be + 時間段 / lo ng + before + 一般現(xiàn)在時It was （was n't） + 時間段 / lo ng + before + 一般過去時（2008 北京，34）

7、Bria n getsrm sorry you've bee n wait ing so long, but it'll still be some timeback.A. beforeB. sinceC. tillD. afterm. by the timeby the time指到某一點(diǎn)時間為止，主句 常用完成時態(tài)。一般情況下，如果 從句表示的是過去時間，主句常用過去完成時；如果從句表示的是將來時間，主句則常用將來完成時。e.g. By the time you come here tomorrow, will have fini shed this work.你明天來這兒

8、的時候，我將已經(jīng)完成此工作了。By the time he was 15he had travelled to more tha n 12 coun tries.到15歲為止，他已經(jīng)去過12個國家了。By the time he went abroad he was 15.他出國那年15歲。（2002上海）from the uni versityHe will have lear ned En glish for eight years by the time hen ext year.A. will graduateB. will have graduatedC. graduatesD. is tograduateIV.no sooner. . . than ，hardly / scarcely / barely when引導(dǎo)的時間狀語從句，其 主句通常用過去完成時，從句通常用一般過去時。e.g. Hardly had he arrivedwhe n she started comp lai n