if 与 whether

题目

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

答案

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,