从属连词及状语从句Word文档格式.docx

1、从句中的动作先于主句中的动作发生，且进行的时间较长时，从句用过去进行时（主句用一般过去时）主句动作和从句动作都已完成，主句动作发生在前，可用过去完成时；从句动作发生在后，用一般过去时 Eg：When they got to the cinema the film had been on five minutes.（2） While主从句动作开始的时间不存在先后关系（即同时发生）或无所谓先后时，主从句同时使用过去进行时，由while 引导My mother was cooking while I was doing my homework last night.Strike while the

2、inn is hot. 趁热打铁。 when 和 while 表为“当。的时候”时，when 引导的从句谓语可以是瞬间动词或延续性动词；while 引导的从句谓语必须是延续性动词Eg：The train had just left when （when/while） we arrived at the station .arrive是瞬间动词。I made some foreign friends when/while I was in London.（3） before.在.之前。表示主句的动作发生咋从句的动作之前。Take the medicine before you go to bed

3、.（4） after 在。之后。表示主句的动作发生在从句的动作之后。After he had finished his composition, he left his office.（5） as soon as 就。从句的动作发生，主句的动作随即发生（主将从现） I will ring you as soon as I get there. I tried to call you as soon as I heard from you, but you were not in. 即当主句时态是过去时，从句的时态也用过去时。（6）since 自以来 1主句（现在完成时）+since+从句（一般

4、过去时） 2It is +时间+从句（一般过去时） It has been+时间+since+从句（一般过去时） 3since 从句的谓语动词必须是延续性的词He has worked in this school since he graduated from BJ normal university.Eg: It is ten years since I began to study English. It has been 8years since I studied English.Do you know Betty well? Yes, she and I have been fri

5、ends since we met in Guangzhou last summer. Oh, dear！Surprised to meet you here. _since we saw last time. It has long time no see.A: It is a long time B: How I miss you .C: I havnt seen you D Its been a long time （7）until /till 1主句的谓语动词是延续性动词时，主句用肯定形式，表示这一动作或状态一直延续到until/till 所表示的时间为止。 Ill wait for

6、you till you come to see me. Ill wait until the rain stops.2当主句是否定句时，主句谓语动词应是瞬间动词 主句的动作发生在从句的动作之前 构成句式：notuntil 有时不用not，而用never（hardly）、nothing（none）等表示否定的词 I didnt go to bed until I finished my homework. I wont leave my office until my work is finished. 这时的until可用before来替换。Leave是瞬间动词 I hardly knew

7、anything about it until you told me. A. since B. after C. until D. when在下列情况下，时间状语从句必须用一般现在时（since引导的时间状语从句除外）主句时态是一般将来时主句中有情态动词can、may、must、had better等主句是祈使句二、条件状语从句if （如果）、as long as（只要）、unless（除非）if 主句为一般将来时，从句用一般现在时 Ill visit the Great Wall if it doesnt rain tomorrow.如果if引导的条件状语从句所表示的前提或条件将来可以实现

8、或正在进行。动词要用现在完成时或进行时。主句通常用将来时 We will give you a good price if you are thinking of buying it.”祈使句and/or 引导的结果状语从句”中，祈使句在意义上相当于一个条件状语从句 Hurry up 、or else/otherwise youll be late Use your head, and youll find a way.= If you use your hand, youll find a way. 在下列情况下，if 引导的条件状语从句必须用一般现在时; Lucy may fall beh

9、ind her classmates if she doesnt study hard.Please call me if many comes tomorrow.If you still have any other questions, please put up your hands.练习;1 Study hard，and youll make great progress.（改成同义句）If you study hard，youll make great progress.2 Study hard，or you will fall behind the others.If you do

10、nt study hard，you will fall behind the others.I dont know if it _ tomorrow。 We wont go hiking if it _ tomorrow. A. will rain； will rain B. rains； rains C. will rain；rains D. rains；will rain if 从句和so 从句的混用 If kate goes to the cinema，_ A. so does Tom B. so will Tom C. neither will Tom D. neither does

11、I wonder if your wife will go hiking. If your wife _, so _. A. does；does she B. will；will mine C. does；will mine D. will；will her If Jim doesnt go swimming tomorrow _ A. so does Tom B. so will Tom C. neither will Tom D. neither does Tom三、原因状语从句 Because（原因） since（既然） as（由于） for（由于）1 because He didnt

12、go to school because he was ill. He was angry because we made a noise._ water is very important to us, we should protect our rivers and lakes. A. So B. Though C. If D. As_ you are not feeling well，youd better stay at home. A. Because B. Since C. Or D. But_ it was raining hard，we had to be indoors. A

13、. As B. Because C. And D. So After school I found mother was sick in bed._ mother was ill，I should do something for her. A. So B. Though C. Since D. If原因状语从句通常用because、since、as引导，这三个词所表示的语气由because到as逐渐减弱。由why 提出的问题用because来回答Because表示原因语气最强，经常表示作者未知的原因Why are you late？Because Im ill. 又可以在强调句型中成为被强调的部分It is because you are lazy that you have lost the job.正因为你懒惰才失去了工作 since 次于because引导的从句，常表示稍加分析后推断出来的原因或指的是人们已知的事实 Since no one is against it,