一、时间状语从句
(一)when，while与as引导的时间状语从句
1．when，while与as引导时间状语从句的区别
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连词
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谓语动词
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用法点津
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when
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延续性动词
非延续性动词
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从句的动作和主句的动作可以同时发生，也可以先后发生
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while
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延续性动词
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从句的动作与主句的动作同时发生
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as
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延续性动词
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强调主从句动作相伴发生，可译为“一边……一边……；随着”
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When they heard the news that Shenzhou Ⅸ had been sent up into space successfully，they jumped with joy.
听到“神舟”九号成功发射的消息，他们高兴地跳了起来。
While I was reading，he came in.
我正在看书时，他进来了。
The students sang as they walked.
