1、意为“当……时候,和……同时”,引导时间状语从句。例如:While I was watching TV,the bell rang。(我看电视时,铃响了。)Tom watched TV while she ate her supper。(汤姆边吃晚饭边看电视。)
2、意为“虽然,尽管”,引导让步状语从句。例如:While it was late,he went on studying。(虽然很晚了,但他还在继续工作。)While he is in poor health,he works hard。(虽然他身体不好,但他还是努力工作。)
3、连接两个并列句子,表示“对比”关系。例如:He went out for a walk,while I stayed at home。(他出去散步了,而我却呆在家里。)
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