whether的用法:whether用法?

whether和if的用法分析

whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用.如:

I wonder if / whether I can get some advice from you.

Ask him whether / if he can come.

但在有些情况下,whether和if的用法有一定区别.

1.whether引导的从句常可以与连词or或or not直接连用,而if一般不能.如:

正:Let me know whether you can come or not.

误:Let me know if you can come or not.

2.当宾语从句提到句首时,只能用whether引导,而不能用if.如:

正:Whether it is true or not,I can’t tell.

误:If it is true or not,I can’t tell.

3.whether可以引导带to的不定式,if则不能.如:

正:I don’t know whether to accept or refuse.

误:I don’t know if to accept or refuse.

4.whether及其引导的成分可放于介词之后,作介词的宾语,但if不能.如:

正:I worry about whether I hurt her feelings.

误:I worry about if I hurt her feelings.

5.whether可以引导从句,作主语、表语或同位语,而if不能.如:

正:It was uncertain whether he would come.

误:It was uncertain if he would come.

正:His first question was whether Tom had arrived yet.

误:His first question was if Tom had arrived yet.

正:We must consider the question whether we will take these measures.

误:We must consider the question if we will take these measures.

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