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中考英语知识点：while、when、as的用法区别 while常表示一个较长的动作，它引导的从句动作与主句的动作是同时发生的、是平行的； when可以表示较短的动作也可以表示较长的动作，主句和从句的动作可以同时发生也可以先后发生； as与上两词同义，可替换while和when， 表示主句和从句的动作同时发生，常译为“一边……一边……”。 如：Please do not trouble me while I am writing my homework. I’ll go home when I have finished my job. They were running quickly across the road when they heard the sound of a truck coming. As we walked in the dark street, we sang songs and talked loudly. (责任编辑：admin) |