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whether和if在从句中的区别！
(1)whether和if有时候可互换，但是从句作介词的宾语时连接词一般只能用whether。
如:
It all depends on whether they will come back.
(2)两者后面都可加or not,但whether后可直接与or not连用。如：
We didn know whether/if he had arrived in Wuhan or not.
we wonder whether or not we should make it clear that weve lost this game.
(3 )if/whether引导主语从句时，whether引导的主语从句可置于句首，但if只能放于句末。
引导表语从句一般只能用whether。
如:
Whether the meeting will be put off has not been decided yet.
The question is whether they have so much money.
(4) whether可以引导同位语从句,用以解释说明前面的名词的内容,但if不能。
如:
They ought to discuss carefully the question whether they can do it or not.
(5)whether可与动词不定式连用,但if不能。
如:
we have not decided whether to go.
(6)whether可引导让步状语从句
意思“不管…..(还是)" ,而if不能。
如:
Whether he comes or not, I will begin our party on time.
