英语语法复习状语从句.pptVIP

* 一个____在复合句中用作状语时,在语法上叫状语从句。从句由_____或________引导。 分类： 状语从句可表示1) ________ 2) _________ 3) _________ 4) _________ 5) _________ 6) _________ 7) _________ 8) _________ 9) _________等 句子 时间 地点 原因 目的 结果 条件 行为方式 比较 让步 名词词组 连词 一. 引导时间状语从句 1. when, while , as, before, after, until, till, since, ever since, once, as soon as ， 2. every time, next/last/each time, the first time, the moment, the minute, the instant 3. hardly…when, no sooner…than, scarcely…when 其中when,till, until,before, after, as soon as,the moment等引导时，如果主句的时态是一般将来时，则从句的时态用一般现在时。 when, while, as _______________ we were talking, Mr Smiths came in. _____ they came home, I was cooking dinner. I was about to go to bed _______ I heard someone knock at the door. 4. ________ we were watching TV, he was studying. 5. He is fat _______ his brother is thin. 6. ______ she sang, tears ran down her face. Conclusion: A: 从句为”当……的时候”,从句谓语为延续性动词,主句谓语为非延续性动词(即终止性动词), 三者可通用. B 当从句的谓语动词为终止性动词,只能用when; 表示”正在那时”, 也只能用when. C.从句和主句的谓语动词都为延续性动词时, 只能用while; while还可作并列连词,表示”而”. D.当强调主句和从句的动作同时发生时,只能用as, 译为”一边……一边……; 随着……” While/ As/ When When when While while As before,after,since He had left the town the day ______ she arrived. It was not long _____ he left his hometown. I played football _____ I (had) finished my homework Please tell her I’ll come _______ I do some shopping. It will not be long _____ we meat each other again. I__________ (be) at his bedside since he _______ (become) ill. It _________ (be) two years since we _______ (begin) to use this machine. before after Conclusion: 1.before引导的从句是过去式, 主句是过去时或过去完成时;. 主句为过去时,after从句可用一般过去时代替过去完成时.since从句用过去时态, 主句一般用现在完成时. It is/ has been+一段时间+since从句 “自从…已经…” It was/ won’t be +一段时间+before从句 “过了…才...” before before after have been became is/ has been began till 与until: 1. He lived with his parents ________ he graduated from college. 2. Not ____ he told me did I