初中英语whether和if的区别 if和whether有什么区别
\u521d\u4e2d\u82f1\u8bed\uff1a\u4f60\u77e5\u9053whether\u548cif\u7684\u533a\u522b\u5417\u4e00\u3001\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5
\u8fd9\u65f6\u4e24\u8005\u7684\u542b\u4e49\u533a\u522b\u5f88\u5c0f\uff0c\u4e00\u822c\u53ef\u901a\u7528\u3002
I don't know whether/if they will come to help us.
\u4f46\u662f\uff0c\u5f53whether\u4e0eor not\u8fde\u6210\u4e00\u4e2a\u8bcd\u7ec4\u65f6\uff0cwhether\u4e0d\u53ef\u6362\u7528if\u3002
I don't know whether or not they will come for our help.
\u82e5whether\u548cor not\u4e0d\u8fde\u5728\u4e00\u8d77\uff0c\u5728\u53e3\u8bed\u4e2d\u53ef\u4ee5\u7528if\u53d6\u4ee3whether\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u7528whether\u3002
I don't care if/whether your car breaks down or not. \u6211\u4e0d\u5728\u4e4e\u60a8\u7684\u8f66\u662f\u5426\u662f\u4f1a\u51fa\u6545\u969c\u3002
\u6b64\u5916\uff0c\u8fd8\u6709\u4e09\u79cd\u60c5\u51b5\u503c\u5f97\u6ce8\u610f\uff1a
(1)\u5728\u4ecb\u8bcd\u540e\u9762\u53ea\u80fd\u7528whether\uff0c\u4e0d\u80fd\u7528if\u3002
I am not interested in whether you'll come or not.
(2)\u5728\u52a8\u8bcd\u4e0d\u5b9a\u5f0f\u4e4b\u524d\uff0c\u53ea\u80fd\u7528whether\uff0c\u4e0d\u80fd\u7528if\u3002
He doesn't know whether to stay or not.
(3)\u5728\u53ca\u7269\u8fd0\u52a8discuss\u540e\u7684\u5bbe\u8bed\u4ece\u53e5\u4e2d\uff0c\u53ea\u80fd\u7528whether\uff0c\u4e0d\u80fd\u7528if\u3002
We discussed whether we should make a change in our plan.
1、if 和whether引导宾语从句时，一般可以互换，但在下列几种情况下只能用whether，不能用if。
（1）当or not紧随引导词之后时。如：we didn't know whether or not she was ready。我们不知道她是否已经做好准备。
（2）从句做介词宾语时。如：i am interested in whether he joined the army。我对他是否入伍很感兴趣。
2、whether 比if正式，if 多用于口语。
3、if可以引导条件状语从句，意为“如果”“假如”，whether则不可。
whether to do 不可以用if to do
whether or not 不用if
介词后用whether不用if
没区别
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