whether引导主语从句放在主句之后时可用if来代替。求例句和详解，谢谢。 英语！！问题
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\u4f8b:Is he the man who/that wants to see you?
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1\uff09who, whom, that\u8fd9\u4e9b\u8bcd\u4ee3\u66ff\u7684\u5148\u884c\u8bcd\u662f\u4eba\u7684\u540d\u8bcd\u6216\u4ee3\u8bcd\uff0c\u5728\u4ece\u53e5\u4e2d\u6240\u8d77\u4f5c\u7528\u5982\u4e0b\uff1a
Is he the man who/that wants to see you?
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2) Whose \u7528\u6765\u6307\u4eba\u6216\u7269\uff0c(\u53ea\u7528\u4f5c\u5b9a\u8bed, \u82e5\u6307\u7269\uff0c\u5b83\u8fd8\u53ef\u4ee5\u540cof which\u4e92\u6362\uff09\u3002
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一、引导宾语从句，一般既可用whether也可用if。但
1. or not放在whether之后时，只能用whether不用if。
I don’t know whether or not he will come. 我不知道他是不是回来。
注1：如果or not放在whether所引导的从句句尾，则可以用if来替换。
I don’t know whether/if he will come or not.我不知道他是不是回来。
2 .在强调任意选择时,用whether…or,此时不用if替换whether。
He asked me whether I wanted to go there by train or by bus.他问我是想乘火车还是坐公共汽车去那里。
注：whether和or一起还有“不管”之意,引导让步状语从句。
Whether he drives or takes the train, he will be here on time.不管开车来还是乘火车来，他都会准时到。
3 .虽引导宾语从句，但为了强调宾语部分，也可把从句放在句首，此时只用whether不用if。
Whether he will come I am not sure.他是不是来我拿不准。
4. 从句作介词宾语时只用whether不用if。
It depends on whether it will be fine.那得看是不是晴天。
5. 作discuss等动词的宾语时，用whether不用if。
We discussed whether we should close the shop.我们讨论是不是该关掉商店。
6 .句子中有if引导的条件句，如再有表示“是否”的宾语从句，用whether不用if。
He asked me whether I’d move to New York if I got the job.他问我如果我得到那份工作是否会搬家到纽约。
7 .容易产生歧义时用whether不用if来表示“是否”。
Please let me know if you need help. 如果你需要帮助请告诉我。或：请告诉我你是否需要帮助。对比：Please let me know if you need help.请告诉我你是否需要帮助。
8. 如果宾语从句为否定句时，则只用if不用whether。
I don’t know if it won't rain tomorrow..我不知道明天是不是会下雨。
二、在引导主语从句、表语从句、同位语从句时一般用whether不用if。如：
⑴Whether it is true remains a question.(主语从句)那是不是真的还是个问题。
⑵The question is whether it is true.(表语从句)问题是是不是真的。
⑶We have a doubt whether it is true.(同位语从句) 我们怀疑那是不是真的。
注:whether引导主语从句放在主句之后时可用if来代替。
It is unclear whether/if he likes the present.他是不是喜欢那个礼物还不清楚。
三、用在动词不定式之前时用whether不用if。
I don’t know whether to go there at once. 我不知道是不是该立刻去那里
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