if和whether有什么区别
if的意思是“是否”和whether的意思一样并且二者同是连接词,可是这二者有什么区别呢,究竟该怎么用呢?
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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1, if ,whether 都可 引导宾语从句, 但如后边有or not , 一般用whether; I don't know whether he comes (or not.) 2,whether 可以引导名词从句, if不行; whether he comes or not depends on the weather.(主语) 3, if(如果)可以引导状语从句, whether不行; If it is fine tomorrow, I'll come to see you.
上面说的太全了,但是只说了两个词引导宾语从句时的不同。 我补充一点,if ,whether的另一个区别就是if 能引导条件状语从句但是whether不能。注意这里是状语了哦。上面说的是宾语。
答:if 有两种意思:如果,是否 whether只有“是否”的意思,二者都做是否讲的时候,whether和if的区别如下: 1 if 不能做介词宾语:如:It de...详情>>
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