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问题: if与wheather作为连词的用法区别

if与wheather作为连词的用法区别

解答:

if与wheather在名词性从句中有时可以互换,但在以下情况只能用wheather:
(1)主语从句,表语从句和同位语从句中;
(2)介词之后的宾语从句中;
(3)动词discuss,don't care等后引导宾语从句.
例如:
It depends on whether she is ready or not.
The question is whether to leave or not.