【句型透视】句中While walking the dog是一个省略句，补全后为While you were walking the dog。

　　省略句的条件 when, while, though, even if, unless, if, as if等引导的状语从句中的主语与主句主语一致或从句主语为it

　　状语从句谓语中动词含有be

　　省略句的形式 省略从句中的主语和be动词

　　In other words, we should keep the earth healthy while using its supply of natural resources.

　　换句话说，当我们利用自然资源的时候，我们应该保持地球的健康。

　　How does the woman feel when asked about the offer price of her flat？

　　当被问及她的公寓卖价的时候，这位女士感觉如何？

　　【对点练习】

　　Ⅰ.用所给动词的适当形式填空

　　①While climbing (climb) the mountain, we enjoyed the warm sunshine and a beautiful view.

　　②When asked (ask) about the secret of his success, he said that he owed much of his success and happiness to his wife and children.

　　③He opened his mouth as if to_say (say) something.

　　Ⅱ.句型转换

　　④Work hard when young, or you'll regret.

　　→Work hard when you are young,_or you'll regret.

　　⑤He looked everywhere as if in search of something.

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