1、,1. While walking the dog, you were careless and it got loose and was hit by a car.While you were walking the dog, you were careless and it got loose and was hit by a car.2. While crossing the road, you should be careful. While you are crossing the road, you should be careful.,在时间、条件和让步等状语从句中, 如果从句主
2、语和主句的主语一致, 且从句的谓语含有be动词的某种形式, 从句的主语和be动词可以省略, 并且要同时省略。,状语从句的省略,状语从句省略句的结构： 连词+分词（-ing、-ed)/形容词特点： 1.从句主语与主句主语相同 2.从句中谓语动词含有be动词,一般说来省略现象多出现在下列五种状语从句中： 1.由when ,while ,as ,before, after, till, until, once等引导的时间状语从句； 2.由whether ,if ,unless 等引导的条件状语从句； 3.由 though ,although ,even if ,whatever等引导的让步状语从句；
3、 4.由 as ,than 等引导的比较状语从句； 5.由as,as if ,as though 等引导的方式状语从句.,熟读深思 阅读下列句子, 指出划线句中省略的单词1. The country singers were playing the guitar while singing.(while 后省略了_ ),they were,2. When asked to answer questions, you should stand up. (When 后省略了_ )3. He will help us do it, if necessary. (if 后省略了 _ ),you are,it is,当从句的主语是 it,谓语动词中又含有系动词be 时 ,可以把it和系动词be一起省略. if necessary/possible/if true/so/not,灵活运用 When 1_(travel)in Shanghai, I happened to meet my friend. We chatted for a little while. Even though 2 _ (invite), I didnt have a drink with him because I was in such a hurry.,invited,traveling,
