在哪些动词后 通常只用 whether而不用if 什么情况下只用whether不用if
\u54ea\u4e9b\u52a8\u8bcd\u540e\u901a\u5e38\u53ea\u7528 whether\u82e5\u662f\u9ad8\u8003\u7684\u5b66\u751f \u53ea\u8981\u8bb0\u5f97 \u540e\u9762or not \u524d\u9762\u5c31\u7528whether\uff08\u6216\u6709\u660e\u663e\u7684\u9009\u62e9\u53e3\u6c14\u65f6 \uff09 \u524d\u9762\u662f\u4ecb\u8bcd \u540e\u9762\u5c31whether\u53e5\u9996\u7528whether\uff08\u4e3b\u8bed\u4ece\u53e5\uff09is\u540e\u8ddfwhether\uff08\u8868\u8bed\u4ece\u53e5\uff09whether\u548cif\u7684\u7528\u6cd5\u533a\u522b\u3000whether\u4e0eif\u4f5c\u201c\u662f\u5426\u201d\u8bb2\uff0c\u5728\u7528\u6cd5\u4e0a\u6709\u76f8\u540c\u4e4b\u5904\uff0c\u4e5f\u6709\u4e0d\u540c\u4e4b\u5904\u3002
\u3000\u3000\u4e00\u3001\u76f8\u540c\u4e4b\u5904\u3002
\u3000\u30001.whether\u548cif\u90fd\u80fd\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\uff0c\u5e38\u7f6e\u4e8esee,ask,learn,tell,wonder,doubt,find out\u7b49\u52a8\u8bcd\u4e4b\u540e\u3002
\u3000\u3000\u5982\uff1aHe asked me whether/is I could help him. I want to know whether/if he lives there.
\u3000\u30002.whether\u548cif\u90fd\u53ef\u7528it\u4f5c\u5f62\u5f0f\u4e3b\u8bed\u4ece\u53e5\u4e2d\u3002\u5982\uff1a it's uncertain whether/if he'll come this evening.
\u3000\u30003.\u5728be uncertain/doubtful\u4e4b\u540e\uff0c\u5e38\u7528whether\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\uff0c\u6709\u65f6\u4e5f\u53ef\u4ee5\u7528if\uff0c\u5982\uff1a We are uncertain whether/if Mary will come.
\u3000\u3000\u4e8c\u3001\u4e0d\u540c\u4e4b\u5904\u3002
\u3000\u30001.whether\u53ef\u7f6e\u4e8e\u53e5\u9996\u5f15\u5bfc\u4e3b\u8bed\u4ece\u53e5\uff0c\u800cif\u4e0d\u80fd\u3002\u5982\uff1a ___the 2000 Olympic Games will be in Beijing is not known yet. A.whether B.If C.Whether D.That \u7b54\u6848\u662fC\u3002
\u3000\u30002.whether\u53ef\u7528\u5728\u4ecb\u8bcd\u4e4b\u540e\uff0c\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\uff0c\u800cIf\u5219\u4e0d\u80fd\u3002\u5982\uff1a Success depends on whether we make evough effort.
\u3000\u30003.whether\u53ef\u5f15\u5bfc\u8868\u8bed\u4ece\u53e5\uff0cif\u5219\u4e0d\u80fd\u3002\u5982\uff1a The puestion is whether it is not worthdoing.
\u3000\u30004.\u5728\u540d\u8bcd\u4e4b\u540e\u5f15\u5bfc\u540c\u4f4d\u8bed\u4ece\u53e5\u65f6\uff0c\u7528whether\u800c\u4e0d\u7528if\u3002\u5982\uff1a The puestion whether the students answered correctly should be decided by the teacher.
\u3000\u30005.whether\u540e\u53ef\u63a5\u4e0d\u5b9a\u5f0f\uff0c\u800cif\u4e0d\u80fd\u3002\u5982\uff1a Please tell us whether to go or stay here.
\u3000\u30006.\u5728\u6709\u4e9b\u52a8\u8bcd\uff08\u5982discuss\uff09\u4e4b\u540e\uff0c\u53ea\u80fd\u7528whether\uff0c\u800c\u4e0d\u7528if\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\u3002\u5982\uff1a We discussed whether we should close the shop.
\u3000\u30007.\u5728\u5f15\u5bfc\u5426\u5b9a\u6982\u5ff5in\u5bbe\u8bed\u4ece\u53e5\u65f6\uff0c\u53ea\u80fd\u7528if\uff0c\u800c\u4e0d\u7528whether.\u5982\uff1ahe asked me if I hadn't finished my work.
1\u3001whether\u53ef\u7f6e\u4e8e\u53e5\u9996\u5f15\u5bfc\u4e3b\u8bed\u4ece\u53e5, if \u5219\u4e0d\u80fd
\u5982\uff1aWhether the 2000 Olympic Games will be in Beijing is not known.
2000\u5e74\u5965\u8fd0\u4f1a\u662f\u5426\u4f1a\u5728\u5317\u4eac\u8fd8\u4e0d\u5f97\u800c\u77e5\u3002
2\u3001whether\u53ef\u5f15\u5bfc\u8868\u8bed\u4ece\u53e5 , if \u5219\u4e0d\u80fd
\u5982\uff1aThe question is whether it is not worth doing.
\u95ee\u9898\u662f\u5b83\u662f\u5426\u4e0d\u503c\u5f97\u505a\u3002
3\u3001whether \u53ef\u5f15\u5bfc\u540c\u4f4d\u8bed\u4ece\u53e5\u65f6, if \u5219\u4e0d\u80fd
\u5982\uff1aThe question whether the students answered correctly should be decided by the teacher.
\u5b66\u751f\u56de\u7b54\u662f\u5426\u6b63\u786e\u7684\u95ee\u9898\u5e94\u7531\u8001\u5e08\u51b3\u5b9a\u3002
4\u3001\u5bbe\u8bed\u4ece\u53e5\u7f6e\u4e8e\u53e5\u9996\u8868\u793a\u5f3a\u8c03\u65f6,\u7528whether ,\u4e0d\u7528 if
\u5982\uff1aWhether this is true, I can't say.
\u6211\u4e0d\u80fd\u8bf4\u8fd9\u662f\u4e0d\u662f\u771f\u7684\u3002
5\u3001\u5728\u4ecb\u8bcd\u4e4b\u540e\u53ea\u80fd\u7528whether\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5,\u800cif \u5219\u4e0d\u80fd
\u5982\uff1aSuccess depends on whether we make enough effort.
\u6210\u529f\u53d6\u51b3\u4e8e\u6211\u4eec\u662f\u5426\u4ed8\u51fa\u8db3\u591f\u7684\u52aa\u529b\u3002
6\u3001\u5728\u52a8\u8bcd\u4e0d\u5b9a\u5f0f\u4e4b\u524d\u53ea\u80fd\u7528whether , \u800cif\u4e0d\u80fd
\u5982\uff1aPlease tell us whether to go or stay here.
\u8bf7\u544a\u8bc9\u6211\u4eec\u662f\u53bb\u8fd8\u662f\u5446\u5728\u8fd9\u91cc\u3002
7\u3001\u5728\u67d0\u4e9b\u52a8\u8bcd\uff08\u5982 discuss ,decide \uff09\u4e4b\u540e,\u53ea\u80fd\u7528whether ,\u800c\u4e0d\u7528 if\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5
\u5982\uff1aWe discussed whether we should close the shop. \uff08\u865a\u62df\u8bed\u6c14\uff09
\u6211\u4eec\u8ba8\u8bba\u4e86\u662f\u5426\u5e94\u8be5\u5173\u95ed\u8fd9\u5bb6\u5546\u5e97\u3002
\u6269\u5c55\u8d44\u6599
\u53ea\u80fd\u7528if\u4e0d\u80fd\u7528whether\u5f15\u5bfc\u7684\u5bbe\u8bed\u4ece\u53e5
if\u5f15\u5bfc\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff0c\u610f\u4e3a\u201c\u5982\u679c\u201d
\u4f8b\u53e5\uff1aThe students will go on a picnic if it is sunny.
\u5982\u679c\u5929\u6c14\u6674\u6717\uff0c\u5b66\u751f\u4eec\u5c06\u53bb\u91ce\u9910\u3002
if\u5f15\u5bfc\u5426\u5b9a\u6982\u5ff5\u7684\u5bbe\u8bed\u4ece\u53e5\u65f6
\u4f8b\u53e5\uff1aHe asked if I didn\u2019t come to school yesterday.
\u4ed6\u95ee\u6211\u6628\u5929\u662f\u5426\u6ca1\u6765\u4e0a\u5b66\u3002
\u5f15\u5bfc\u72b6\u8bed\u4ece\u53e5even if\uff08\u5373\u4f7f\uff09\u548cas if\uff08\u597d\u8c61\uff09\u65f6
\u4f8b\u53e5\uff1aHe talks as if he has known all about it.
\u4ed6\u8bf4\u8bdd\u7684\u6837\u5b50\u597d\u50cf\u4ed6\u5df2\u7ecf\u77e5\u9053\u4e86\u4e00\u5207\u3002
一、相同之处。
1.whether和if都能引导宾语从句，常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。
如：He asked me whether/is I could help him. I want to know whether/if he lives there.
2.whether和if都可用it作形式主语从句中。如： it's uncertain whether/if he'll come this evening.
3.在be uncertain/doubtful之后，常用whether引导宾语从句，有时也可以用if，如： We are uncertain whether/if Mary will come.
二、不同之处。
1.whether可置于句首引导主语从句，而if不能。如： ___the 2000 Olympic Games will be in Beijing is not known yet. A.whether B.If C.Whether D.That 答案是C。
2.whether可用在介词之后，引导宾语从句，而If则不能。如： Success depends on whether we make evough effort.
3.whether可引导表语从句，if则不能。如： The puestion is whether it is not worthdoing.
4.在名词之后引导同位语从句时，用whether而不用if。如： The puestion whether the students answered correctly should be decided by the teacher.
5.whether后可接不定式，而if不能。如： Please tell us whether to go or stay here.
6.在有些动词（如discuss）之后，只能用whether，而不用if引导宾语从句。如： We discussed whether we should close the shop.
7.在引导否定概念in宾语从句时，只能用if，而不用whether.如：he asked me if I hadn't finished my work.
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