作业帮What the doctors really doubt is ____my mother will recover from the serious disease soon.为什么用weither不用if
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What the doctors really doubt is ____my mother will recover from the serious disease soon.为什么用weither不用if
What the doctors really doubt is ____my mother will recover from the serious disease soon.
为什么用weither不用if
What the doctors really doubt is ____my mother will recover from the serious disease soon.为什么用weither不用if
whether可以引导从句,作主语、表语或同位语,而if不能.如：
正：It was uncertain whether he would come.
误：It was uncertain if he would come.
正：His first question was whether Tom had arrived yet.
误：His first question was if Tom had arrived yet.
正：We must consider the question whether we will take these measures.
误：We must consider the question if we will take these measures.
这一题，whether if 都可以用的啊
1. 引导主语从句并在句首时不用if。如：
Whether we go there is not decided. 我们是否去那里还没决定。
2. 引导表语从句时不用if。如：
The question is whether we can get there on time. 问题是我们能否按时到达那里。
3. 引导同位语从句时不用if。如：
He aske...
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1. 引导主语从句并在句首时不用if。如：
Whether we go there is not decided. 我们是否去那里还没决定。
2. 引导表语从句时不用if。如：
The question is whether we can get there on time. 问题是我们能否按时到达那里。
3. 引导同位语从句时不用if。如：
He asked me the question whether the work was worth doing. 他问我这个问题，那项工作是否值得做。
4. 在介词后引导宾语从句不用if。如：
I’m thinking about whether we’ll have a meeting. 我在考虑我们是否要开个会。
5. 直接与not连用时不用if。如：
I don’t know whether or not you will go. 我不知道你是否去。
6. 宾语从句置于句首时不用if。如：
Whether you have met George before, I can’t remember. 我不记得你以前是否见过乔治。
7. 在discuss等之后时不用if。如：
We’re discussing whether we’ll go on a picnic. 我们在讨论是否要去野餐。
8. 在动词不定式前用whether不用if。如：
He doesn’t know whether to go or not. 他不知道是否去。
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