(3)某些用法比较特殊的从属连词用法区别
1.当while, when, as引导时间状语从句时的区别:①while引导的状语从句中动词必须是持续性。谓语动词多为进行时,或状态动词的一般时。while 的这些用法可用when代替,等于 “at the time that”, “during the time that”。例如:Please keep quiet while (when) others are studying;② when除可指一段时间外,还可用来指一点时间,等于 “at the time”,也就是说when引出的时间状语从句中的谓语动词可以是终止性的,也可以延续性的。因此主句和从句的谓语可以是一般时,进行时,或完成时。例如:When I went into the lab, the teacher was doing an experiment.(when不能换成while)He often makes mistakes when he is speaking English.(when可换成while)③as常可与when,while通用,但强调“一边、一边”。例如:As (when, while) I was walking down the street, I noticed a police car in front of number 37. ④when引导的状语从句中的主语与主句主语一致,主、谓是“主语+系动词”结构时,这时主语和系动词可以省略。例如:When (he was) young, he worked for a rich man./ She’ll be here to give you help when (if it is) necessary. ⑤when有时代替if,引导条件句,意为“如果”、“假如”,例如:I’ll come when (if) I’m free.
2.before作连词一般表示时间,意为“在…之前”,但有些句子中转译成其他意思。试看以下句子的翻译:He almost knocked me down before he saw me.他几乎把我撞倒才看见我;Before I could get in a word he had measured me.我还没来得及插话,他已经给我量好了尺寸。
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