一般疑问句：
Will she come?
Does he need any help?
Do you need any help?
名词性从句——宾语从句
I don't know whether/if she will come.
I wonder whether she will come.
I wonder whether or not she will come.
I wonder whether she will come or not.
名词性从句——主语从句
Whether she comes or not is unimportant to me.
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