when和while
when和while都可表示“当……的时候”，引导时间状语从句。你知道两者在过。
去进行时中的用法有什么不同吗？
请仔细观察下面的例句，然后补全空格中的内容。①i was walking to school when i saw a cat in a tree.
when sally arrived home, her mother was cleaning the house.
主句的动作是持续性的，而从句动作是短暂性的，此时用___引导时间。
状语从句，主句用时态，从句用一般过去时态。
while i was sleeping in the bedroom, someone knocked at the door.④d**id fell while he was riding his bike.
主句的动作是短暂性的，从句的动作是持续性的，此时用___引导从。
句，主句用时态，从句用过去进行时态。
while andy was waiting for the bus, he was reading a news*****.⑥he was cleaning his car while i was cooking.
主句和从句的动作在过去的某时刻或某段时间同时发生，而且动作都是持续。
性的，此时用___引导从句，而且主句和从句都用时态。
练习：用when和while填空。
1. we were singingthe teacher came in.
2i was doing my homework , my mother was cooking.3. what were you doingthe rainstorm came ?
4i was waiting for the bus at the bus station, it began to rain.5he woke up, the smoke was rising.
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