if 与 whetherHis first question was if Peter had come yet这句话有什么错误么（偏向if和whether中的区别,若时态错误不用说）if和whether3Q能不能也解释一下那句话为啥用if/whether，3Q 也说说那句话的对错或

if 与 whetherHis first question was if Peter had come yet这句话有什么错误么（偏向if和whether中的区别,若时态错误不用说）if和whether3Q能不能也解释一下那句话为啥用if/whether，3Q 也说说那句话的对错或
if 与 whether
His first question was if Peter had come yet
这句话有什么错误么（偏向if和whether中的区别,若时态错误不用说）
if和whether
3Q
能不能也解释一下那句话为啥用if/whether，3Q
也说说那句话的对错或者怎么改额

if 与 whetherHis first question was if Peter had come yet这句话有什么错误么（偏向if和whether中的区别,若时态错误不用说）if和whether3Q能不能也解释一下那句话为啥用if/whether，3Q 也说说那句话的对错或
没有错误
if和whether引导表语从句
引导表语从句时,一般用whether.例如：
The question is whether they can cooperate with us.问题是他们能否与我们合作.
The question I whether we can get there in time.
有的语法认为if 也可以引导表语从句,例如：
The first question I put to him was whether/if he would do it.
Our only problem is if someone gets that brilliant notion first.
不过,对中学生来说,这种用法还是尽时不时避免为好.
竭诚相助,

最简单的一点，if 后面不能跟not
比如说你可以说i wonder whether he likes me or not
但是如果用if只能说i wonder if he likes me
在其他的情况下，表示是否的时候，两个词差别没有很大

这里是选whether对的
当你做条件的时候你选if
If you come here tomorrow, please do not forget to bring my book.
如果是宾语从句，则是两个都可以
I wonder whether/if you like to play football.
如果是当名词性从句，放前面的时候，则用wheth...

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这里是选whether对的
当你做条件的时候你选if
If you come here tomorrow, please do not forget to bring my book.
如果是宾语从句，则是两个都可以
I wonder whether/if you like to play football.
如果是当名词性从句，放前面的时候，则用whether比如
Whether you will come or not is not important.

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If和whether的用法如下：
1.If可以引导条件状语从句和宾语从句:
If you study hard, you will pass the English examination.(条件状语从句)
He asked me if I could speak English.(宾语从句)
2.Whether可以引导主语从句、宾语从句和表语从句：

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If和whether的用法如下：
1.If可以引导条件状语从句和宾语从句:
If you study hard, you will pass the English examination.(条件状语从句)
He asked me if I could speak English.(宾语从句)
2.Whether可以引导主语从句、宾语从句和表语从句：
Whether you will come or not is not important.(主语从句)
I wonder whether you like to play volleyball.(宾语从句)
My question is whether David has come yet.（表语从句)
“His first question was if Peter had come yet”这句话有错误。因为“Peter had come yet”作系动词“was”的表语，所以只能用连词"whether”连接句子，而不能用连词“If"来连接句子。

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