摘要：whether, if引导从句的用法区别:①引导主语从句.表语从句或同位语从句时.用whether.不用if.例如:Whether they will go to the Great Wall is not known./ The question is whether we can finish the task on time./ The question whether we will take part in the physics contest has not been decided. ②whether可接不定式.而if则不可.例如:I haven’t decided whether to leave or not. ③whether可作介词的宾语或置于句首表示强调.而if则不可.例如:Everything depends on whether we have enough money./ Whether he will come, I am not sure. ④whether和if均可引导宾语从句. whether引导的宾语从句一般都是肯定句.if引导的宾语从句可以是肯定的.也可以是否定的.例如:Could you tell us whether/ if it rains in winter in Australia?/ I wonder if it doesn’t rain. ⑤引导宾语从句的whether和if常可与or not连用.连用时要注意or not的位置.它一般与 whether.if分开使用.有时它可与whether合起来使用.但不能与if合起来使用.例如:I don’t know whether/ if they will come or not./ I don’t know whether or not they will come. ⑥if可用来引导条件状语从句.译“如果 .whether则不行.例如:If you work hard, you are sure to succeed.

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