if和whether在引导宾语从句中有什么区别？ if 和whether在宾语从句中有什么区别
if\u548cwhether\u5728\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\u4e2d\u6709\u4ec0\u4e48\u533a\u522b\u4e00\u3001\u4e0eor\u6216or not \u8fde\u7528\u65f6\u7528\u6cd5\u4e0d\u540c
1\u3001 whether\u5f15\u5bfc\u7684\u4ece\u53e5\u5e38\u53ef\u4ee5\u4e0e\u8fde\u8bcdor\u6216or not\u76f4\u63a5\u8fde\u7528\u3002\u5982\uff1a
Let me know whether you can come or not.\uff08\u7528whether\u4e0d\u7528if\uff09
\u8ba9\u6211\u77e5\u9053\u4f60\u80fd\u4e0d\u80fd\u6765\u3002
2\u3001if\u4e00\u822c\u4e0d\u80fd\u4e0e\u4e0e\u8fde\u8bcdor\u6216or not\u8fde\u7528\u3002
\u4e8c\u3001\u5f53\u5bbe\u8bed\u4ece\u53e5\u63d0\u5230\u53e5\u9996\u65f6\u7528\u6cd5\u4e0d\u540c
1\u3001\u5f53\u5bbe\u8bed\u4ece\u53e5\u63d0\u5230\u53e5\u9996\u65f6\uff0c\u53ea\u80fd\u7528whether\u5f15\u5bfc\u3002
\u5982\uff1aWhether it is true or not, I can\u2019t tell. \uff08\u53e5\u9996\u7528whether\u4e0d\u7528if\uff09
\u8fd9\u662f\u4e0d\u662f\u771f\u7684\uff0c\u6211\u4e0d\u80fd\u5206\u8fa8\u3002
2\u3001\u5f53\u5bbe\u8bed\u4ece\u53e5\u5728\u53e5\u9996\u65f6\uff0c\u4e0d\u80fd\u7528if\u5f15\u5bfc\u3002
\u4e09\u3001\u5728\u4ecb\u8bcd\u4e4b\u540e\u7528\u6cd5\u4e0d\u540c
1\u3001whether\u53ca\u5176\u5f15\u5bfc\u7684\u6210\u5206\u53ef\u653e\u4e8e\u4ecb\u8bcd\u4e4b\u540e\uff0c\u4f5c\u4ecb\u8bcd\u7684\u5bbe\u8bed\u3002\u5982\uff1a
I worry about whether I hurt her feelings.
\u6211\u62c5\u5fc3\u6211\u662f\u5426\u4f24\u4e86\u5979\u7684\u611f\u60c5\u3002
2\u3001if\u4e0d\u80fd\u653e\u5728\u4ecb\u8bcd\u4e4b\u540e\u3002
\u56db\u3001\u540e\u63a5\u4e0d\u5b9a\u5f0f\u7684\u7528\u6cd5\u4e0d\u540c
1\u3001whether\u53ef\u4ee5\u5f15\u5bfc\u5e26to\u7684\u4e0d\u5b9a\u5f0f\u3002
I don\u2019t know whether to accept or refuse.
\u6211\u4e0d\u77e5\u9053\u662f\u5426\u63a5\u53d7\u6216\u62d2\u7edd\u3002
2\u3001if\u4e0d\u80fd\u5f15\u5bfc\u5e26to\u7684\u4e0d\u5b9a\u5f0f\u3002
\u5bbe\u8bed\u4ece\u53e5\u5927\u4e32\u8bb2\uff08\u4e8c\uff097min\u770b\u61c2if\u548cwhether\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\u7684\u533a\u522b
区别：whether可以引导介词后的宾语从句，if不可以。
I worry about whether I hurt her feeling.
I wonder if/whether he can come tomorrow.
由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。
例句：I wonder whether(if) they will come to our party.
只能用whether，不能用if引导的宾语从句- 在带to的不定式前
eg：We decided whether to walk there. - 在介词的后面
eg：I’m thinking of whether we should go to see the film. - 在动词后面的宾语从句时
eg：We discussed whether we had a sports meeting next week - 直接与or not连用时
eg：I can’t say whether or not thet can come on time.
- if引导条件状语从句，意为“如果”
eg：The students will go on a picnic if it is sunny. - if引导否定概念的宾语从句时
eg：He asked if I didn’t come to school yesterday. - 引导状语从句even if（即使）和as if（好象）时
eg：He talks as if he has known all about
if,whether在宾语从句中的区别
① if和whether在作“是否”解时,引导宾语从句常放在动词know,ask,care,wonder,find out等之后,介词后一般不用if
② 少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether.
③ whether后可以加or not,但是if不可以.
④ 在不定式前只能用whether.
（如：I can’t decide whether to stay. 我不能决定是否留下。）
⑤ 避免歧异时,我们常用whether而不用if.
1 在动词不定式之前只能用whether 。
2 只能说 whether …… or not ，不能说 if... or not。
3 在介词后，只能用whether。
4 宾语从句放在句首表示强调时，只能用whether 。
5 用if会引起歧义时，只用whether。如用whether可避免歧义。
whether在表示是否的意思的时候，后面可以加or not，这是两者唯一的区别，例如可以whether you like it or not 但是不能if you like it or not
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