时间状语从句

,单击此处编辑母版标题样式,while, when, before, after, as soon as, since,until,引导时间状语从句的用法,1. while,的用法,(1).,引导时间状语从句，意为“当,时,候”“在,期间”。,His parents died,while,he was at school.,在他上学期间他父母去世了。,(2).,引导时间状语从句，意为“与,同时”。,You may go swimming,while,Im having lunch.,我吃午饭的时间里你可以去游泳。,时间状语从句,Grammar,引导时间状语从句：,at / during / after the time that,在,/,当,时；在,之后,I loved math,when,I was at school.,我在学校时喜欢数学。,He looked aside,when,I spoke to him.,我对他说话的时候，他向旁边看。,2. when,的用法,while, when,用法辨析：,(1). while,引导时间状语从句作“,当,时候,”讲时，只能与,延续性,动词连用。,(2). when,引导时间状语从句作“,当,时候,”讲时，既可与,延续性,动词也可与,瞬间动词,连用。,While,he was reading, he fell asleep.,他在读书的时候睡着了。,When,he came in, I was having lunch.,他来时我正在吃午饭。,3. before,的用法,(1). before,用作连词，其基本词义是“ 在,-,之,前”，用来表示时间或顺序。如：,Turn the light off,before,you sleep.,睡前先把灯熄掉,.,Think,before,you speak.,说话之前应先想清楚,.,但在不同的语境中,before,有不同的翻译,4. after,的用法 在,之后,(1).,prep.,After,testing,some students look very happy.,考试结束后，一些学生看起来很高兴。,(2).,adv.,It happened twenty years,after,.,这事发生在,20,年之后。,(3).,conj.,we all missed you,after,you left.,你走了以后， 我们都很想你,5. as soon as,的用法,as soon as,连接的时间状语从句中，指未发,的动作，,规律是：主句一般将来时，从句用,一般现在时代替一般将来时,(,主将从现,),如：,I will tell him the news,as soon as,he comes back,。,他一回来我就把这个消息告诉他。,指紧接着发生的两个短动作，主从句都用一般过去时,He took out his English books,as soon as,he sat down.,他一坐下就拿出了他的英语书。,6. since,的用法,since,作连词引导时间状语从句的用法,(,1).,若,since,引导的状语从句的,谓语动词,是,终止性,的过去时，则从句表示的时间是,“从动作开始的那一时刻起”,We have been missing them since they left here.,自从他们离开这里，我们就一直很想念他们。,(2).,若,since,引导的状语从句的谓语动词是,持续性动词或表示状态的动词的过去时,时，则从句表示的时间是,“从那持续动作结束或状态结束时算起”。,I havent heard any noise,since,I slept.,sleep,为持续性动词，,sleep,的动作结束时，,即“醒来”,我醒后还未听到任何声音。,I have not heard from him,since,I lived in Shanghai.,自从我离开,(,没住在,),上海，就再也没有收到他的信 。,(3).,若,since,引导的状语从句的谓语为,持续性动词的现在完成时,，则表示从,动作和状态发生延续到现在（说话时刻）。,I havent heard from him,since,he has lived there,。,自从他（开始）住在那儿起，我就一直没收到他的来信。,这里,has lived,表示动作的持续性，时间的起点应从：“开始居住”时算起。,7. until,的用法,(1).,介词,until,表示“直到某一时刻,;,直到发生某事”,用于肯定句中：,ItmaylastuntilFriday.,这可能要延续到星期五。,Hewillbeworkinguntil5oclock.,他将一直工作到五点钟。,until,用于肯定句中，,表示句子的动作一直持续到,until,短语所表示的时间为止，即表示动作的终点,。,一般可译为“直到,时,(,为止,)”,或“在,以前”,。,(2).,连词,until,表示“,(,直到,时为止,)”,用于肯定句中,Continueinthisdirection,until,youseeasign.,一直朝着这个方向走就会看见指示牌了。,一般可译为,“,直到,.,为止,”。在这种用法中，主句的谓语动词必须是持续动词,(,非瞬间动词,),，如,live,wait,last,love,like,stay,work,continue,等,用于否定句中：,I,hadnt,know shewasforeign,until,shespoke.,她不说话我还一直不知道她是个外国人。,作连词的,until,用于否定句中，从句先发生，主句再发生。一般可译为“直到,才。,二,.,单项选择,1.A scientist must practice a lot _he,can use all data tools well.,A. as soon as B. when C. until D. before,2._ she realized what was happening,she was hit over the head.,A. When B. Before C. Since D. As,B,D,3. why didnt you help the little boy?,-Oh, sorry. He had struggled to his,feet_ I ran over.,A. until B. after C. before D. since,4. He made a mistake, but then he,corrected the situation _it got worse.,A. until B. when C. before D. as,C,C,5. Scientists say it may be 5 years_ it,is possible to test this medicine on,human patients.,A. Since B. after C. before D. when,6. Someone called me up in the middle,of the night, but they hung up _ I,could answer the phone.,A. as B. since C. while D. before,C,D,7. Youd better give it up _ it is too late,as its very dangerous.,A. before B. as C. when D. since,8. It would be months _ he was fit for,work.,A. until B. since C. before D. after,A,C,9. It was evening _ we reached the,little town of Winchester.,A. that B. until C. since D. before,10. The scientists had tried out many,kinds of chemicals _ they found,the right one.,A. since B. after C. before D. when,D,C,