状语从句总述时间状语从句地点和条件状语从句原因和结果状语从句.ppt

状语从句总述 时间状语从句 地点和条件状语从句 原因和结果状语从句 目的和让步状语从句 方式和比较状语从句 测评 总述 　　　在复合句中担任状语成分的从句，称为状语从句，状语从句可以用来修饰主句中的动词、形容词或副词等，有时修饰整个句子。 　　　状语从句可分为时间、地点、原因、条件、方式、让步、目的、结果、比较状语从句等９种。状语从句放在主句之前时，常用逗号分开；放在主句之后，一般不用逗号。每类状语从句有各自不同的引导词。 常用句型有: It is long before…… 好久才…… It isn’t/won’t be long before…… 过了不久就…… 如:It will be a long time before she comes back from Australia. 4.after(在……以后) 5.as soon as, no sooner...than, hardly…when, scarcely…when/before (一…就),表示主句和从句动作先后发生. 如:I’ll phone you as soon as I get to Guangzhou. 6.since(自…以来) *since+瞬间动词的过去式(前面常用现在完成时) *It is/had been+时间段+since……瞬间动词的过去时 如:It is three years since she joined the army. 7.常见的可用作连词引导时间状语从句的名词短语及副词 还有:the moment, the minute, every time, each time, the last time, the year等. 如:Don’t stop each time you meet with a word you don’t understand. when, until/till, before, as soon as, the moment等引导时间状语从句时,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.(主将从现) 如:Don’t worry about him. He’ll ring you when he gets there. 地点状语从句 地点状语从句常用where 和wherever引导. 如:We shall go where working conditions are difficult. Where there is will, there is a way. Wherever there is plenty of sun and rain, the fields are green. 条件状语从句 1.常用来引出条件状语从句的连词 有:if, so/as long as, unless, in case, so far as, provided (that), on condition that.如: If you go to the cinema tomorrow, I’ll go with you. We won’t go to his party unless he invites us. 测评 1.The river will be further polluted _____ some measures ______. A. unless; are taken B. unless; will be taken C. if; are taken D. if; will be taken 2.We’d better encourage him ______ he can smooth away the difficulties. A. so as to B. as though C. in order to D. in order that 3._______you are free tonight, why not drop in and play chess with me? A. For B. Since C. Because D. Even if 4._______, mother will wait for him to have dinner together. A. However late is he B. However late he is C. However he is lat