复合句时态一致

1、条件状语从句和时间状语从句与主句时态一致的情况主从复合句中时态一致（主过从过，主将从现，主现从任”原则）主从复合句中时态的一致是中考考点之一。主要有以 下几种情况：【主将从现】在以 when , after , as soon as 等引导的时间状语 从句以及以if, unless等引导的条件状语从句中，如 果主句是一般将来时，从句则用一般现在时。例如：i'll tell her the good news when she comesback.当她回来的时候，我将把这个好消息告诉她。if it doesn't rain, he will come here on time.如

2、果不下雨，他会按时来这儿的。常见的有以下三种情况：一、条件状语从句的主句是一般将来时，那么从句常 常用一般现在时。如：when i grow up, i ' ll be a nurse and look after patients.我长大后要当一名护zt,照顾病人。二、如果主句是祈使句，那么从句通常要用一般现在时。如： dod t laugh at me when i make a mistake.我犯错误的时候不要笑话我。三、如果主句是含有情态动词的一般现在时，根据需 要从句多用一般现在时。如： you should be quiet when you are in theread

3、ing room.在阅览室时应保持安静。【主过从过】在含有宾语从句的主从复合句中，当主句的谓语动词 为过去时态时,从句须用表示过去的某种时态。 例如:he asked when they would go to the party.他问他们什么时候将去参加聚会。miss green said she had been to beijing before.格林小姐说她以前曾经去过北京。【主现从任】在宾语从句中，当主句的时态为一般现在时、现 在进行时、现在完成时等时态时，后面从句时态不受 主句限制，可根据情况，选用各种适合的时态。例如:do you know when we'll have

4、 a footballmatch?你知道我们什么时候举行足球赛吗？you know he has gone to shanghai.你知道他已去上海了。【特别关注】1 .当宾语从句表述的是客观事实、科学真理、现在的 习惯动作以及格言等时，其时态不受主句限制，而用 一般现在时。例如：the teacher told us that light travels faster than sound.老师告诉我们光速比音速要快。when i was a student, my teacher often told us that time and tide wait for no man.当我还是学生

5、的时候，老师常常告诉我们，岁月不 等人。2 .在"since +点时间"句型中，主句通常用现在完成 时，从句用一般过去时。例如：he has worked at the factory since he camehere.自从他来到这儿，他就一直在这家工厂上班。另外，在句型"it's+段时间+ since +从句”中since 后面的从句要用一般过去时。例如：it's a long time since we met last.自从我们上次见面以来已经有好长时间了。3 .在复合句中，如果主、从句表示的动作或状态都发 生在过去，而且有先后，则在先的用

6、过去完成时，在 后的用一般过去时。例如：when he got there, the train had left.当他到那儿的时候，火车已经开了。he said he had visited the school before.他说他以前参观过那所学校。【小试身手】1. if he harder , he will catch up with ussoon.（04 北京）a. study b. studies c. will study d. studied 2. i will go swimming with you if ifree tomorrow.（04 哈尔滨）a. will be

7、 b. shall be c. am d.was1. if you a chance to study in a foreigncountry ,just take it .（04 苏州）a. getting b. had got c. will get d. get4. don ' t leave until he back. （）a. have come b. comes c. will come d. came5. “ shall we have the volleyball matchtomorrow? ”“ oh, it will be put off if it.（04黄冈

8、）a. snows b. is snowing c. snowed d. will snow6. tell him about the news when he,john.yes, i will. （04 宁波）a.comes b.will come c.would d.is coming7 .tomorrow we will go to the city park it issunny.（05 安徽） a.as soon as b. when c. if d. as8 .please don ' t leave until your teacher back.（05 河南）a. will come b .came c. comes d. iscoming9 .i want to know if there a sports meetingnext month . if they it , i must get ready forit。（05 青岛）a. is,will holdb. will be, holdc. will be, will hold d. will have, hold10. 一 mar