whether引导的从句为什么有的加or not有的不加

如题所述

当由一般疑问句充当宾语从句时,用if或whether引导,意为“是否”.如:
Alice wanted to know if/whether her grandmother liked the bag.爱丽斯想知道她祖母是否喜欢这个包.
I don't know whether he'll come the day after tomorrow.我不知道他后天是否会来
但直接与or not连用时,往往用whether(if…or not也可以使用).如:
Let me know whether / if he will come or not.(= Let me know whether or not he will come )让我知道他是否能来.
I don't know whether / if he does any washing or not.(= I don't know whether or not he does any washing.)我不知道他在家洗不洗衣服.
I wonder whether we stay or whether we go.我想知道我们是去还是留.
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