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, 假如从句主语和主句主语一致, 且从句谓语含有be动词某种形式, 从句主语和be动词能够省略, 而且要同时省略。
状语从句省略
状语从句省略句结构: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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