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感谢亲观看此幻灯片，此课件部分内容来源于网络， 如有侵权请及时联系我们删除，谢谢配合！
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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
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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；
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.
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[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_t_h_e_y_w__e_r_e )
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2. When asked to answer questions, you should stand up.
(When 后省略了_y_o_u__a_r_e_ )
3. He will help us do it, if necessary.
2. While crossing the road, you should be careful. While you are crossing the road, you should be careful.
