2022年初中英语宾语从句只能用whether的情况

   只能用whether:

   ①在具有选择意义,又有or或or not时,尤其是直接与or not连用时,往往用whether(if…or not也可以使用)。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.我不知道他洗不洗衣服。I wonder whether we stay or whether we go.我不知道我们是去还是留。

   ②在介词之后用whether。I'm interested in whether he likes English.我关心的是他是否喜欢英语。We're thinking about whether we can finish the work on time.我们正在考虑是否能按时完成这项工作。I worry about whether I hurt her feelings.我担心是否伤了她的感情。

   ③在不定式前用whether。He hasn't decided whether to visit the old man.他尚未决定是否拜访那位老人。I don't know whether to go.我不知去否。He hasn't decided whether to go by bus or by train.他还未决定是乘公共汽车去还是坐火车去。

   ④whether置于句首时,不能换用if。Whether this is true or not,I can't say.这是否真的我说不上来。

   ⑤引导主语从句和表语从句时宜用whether。Whether she will come or not is still a question.她是否能来还是个问题。The question is whether we can catch the bus.问题是我们能否赶上公共汽车。

   ⑥若用if会引起歧义时,则用whether。Please let me know if you like the book.

   可理解为:a.Please let me know whether you like the book.请告诉我你是否喜欢这本书。

   b.If you like the book,please let me know.你如果喜欢这本书,请告诉我。

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