摘要：1．While walking the dog, you were careless and it got loose and was hit by a car. =while you were walking the dog,-- 省略了walk 的逻辑主语you 和be 动词were, 以避免重复. While living in England, he picked up some English. =while he was living in England,-. When asked about the secret of his success, he said that he owed it to his wife. =when he was asked about the -. 用法拓展:当连词when, while, before, after等引导的时间状语从句的主语与主句的主语一致时.可将从句中的主语和 be动词省去. While through the park, we saw a fine flower show. A. walked B. walking C. walks D. being walking When from the hill, the buses look small. A. seen B. seeing C. see D. to see (B; A, see和buses 构成逻辑上的动宾关系.而且是被动关系.)

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