题目内容
9．她病得如此严重以致明天是否能来还不清楚．She was so seriously ill that it was not clearwhether she will comeornot．
分析 她病得如此严重以致明天是否能来还不清楚．
解答 答案：whether，or not．考查whether引导的主语从句．句子里it做形式主语，主语从句由whether引导，表示"是否"．if不能和or not连用．
点评 考查汉译英．
whether和if的区别：
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．
