He sang songs as he was taking a bath.

　　As spring warms the earth, all flowers begin to bloom.

　　注：when有时作并列连词意为正在这时、突然，在句末，不能位于句首。从句的谓语动词常用一般过去时，主句通常用过去进行时、过去完成时或be about to结构等。

　　She was about to leave when Mark arrived so she stayed a little longer.

　　He had been walking under the trees when an apple fell down.

　　Ⅱ) as soon as, hardly when , no sooner than 等引导的时间状语从句，意为 一 就

　　Jack had scarcely /hardly seen me when he left the room.

　　The spy had no sooner returned home than he was told to go to another country.

　　那个间谍一踏进国门就奉命要去他国。

　　注： 在no sooner than, hardly when 引导的时间状语从句中，若把no sooner, hardly, scarcely, barely 放在句首，则要用倒装结构。

　　No sooner had he heard the news than he fainted.

　　Scarcely had he entered the room when the telephone rang.

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