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if和whether引导的名词从句复习知识点精析精练

2022-07-03 发布于 郾城百科网
if和whether引导的名词从句复习知识点精析精练
1)yes-no型疑问从句
从属连词if, whether引导的名词从句是由一般疑问句或选择疑问转化而来的,因此也分别被称为yes-no型疑问句从句和选择型疑问从句,其功能和wh-从句的功能相同, 例如:
主语:Whether the plan is feasible remains to be proved. 这一计划是否可行还有等证实。
宾语:Let us know whether / if you can finish the article before Friday. 请让我们知道你是否能在星期五以前把文章写完。
表语:The point is whether we should lend him the money. 问题在于我们是否应该借钱给他。
同位语:They are investigating the question whether the man is trustworthy. 他们调查他是否值得信赖。
形容词宾语: She's doubtful whether we shall be able to come. 她怀疑我们是否能够前来。
介词宾语: I worry about whether he can pass through the crisis of his illness. 我担心他是否能度过疾病的危险期。
2)选择性疑问从句
选择性疑问从句由关联词if/whether…or或whether…or not构成,例如:
Please tell me whether / if they are Swedish or Danish. 请告诉我他们是瑞典人还是丹麦人。

I don't care whether you like the plan or not.我不在乎你是否喜欢该计划。

高中英语单词表3500词必背
英语单词记忆法
人教版初中英语单词

if和whether的区别: 
1、 在动词不定式之前只能用whether 。如: 
例8 I can’t decide whether to stay. 我不能决定是否留下。 
2、 在whether …… or not 的固定搭配中。如: 
例9 I want to know whether it’s good news or not . 我想知道是否是好消息。 
3 、在介词后,只能用whether。如: 
例10 His father is worried about whether he lose his work . 他的父亲担心是否会失去工作。 
4、宾语从句放在句首表示强调时,只能用whether 。如: 
Whether this is true or not, I really don’t know. 这是否真的,我真的不知道。
(例11 Whether they can finish the work on time is still a problem . 他们是否能准时完成这项工作还是个问题。--此例为主语从句,有误,感谢指出) 
5、用if会引起歧义时,只用whether。如: 
例12 Could you tell me if you know the answer ? 
这句话有两种意思:“你能告诉我是否知道答案吗?”或“如果你知道答案,请告诉我,好吗?”。如用whether可避免歧义. 

1. It's uncertain ________ the experiment is worth doing.   
A. if B. that C. whether D. how
2. They would have fixed the telephone yesterday _________ it was a holiday.
A. except B. except for C. except that D. but for
3.________ is to do good all one's life and never do anything bad.
 A. Whichever is hard B. No matter what is hard  C. What is hard D. All what is hard
4.________ the boy didn't take medicine made his mother angry.   
A. That B. What C. How D. Which
5. As the day was fine, I made the suggestion ________ for a walk in the park.
A.we go B.we will go C.should we go D.that we go
6.____ we can't get seems better than ____ we have.   
A. What, what B. What, that  C. That, that D. That, what
7.____ you don't like him is none of my business.    
A. What B. Who C. That D. Whether
8. You can't imagine ____ when they received these nice Christmas presents.
A. how they were excited B. how excited they were  C. how excited were they D. they were how excited
9.____ we'll go camping tomorrow depends on the weather.   
A. If B. Whether C. That D. Where
10________he really means is ________he disagrees with us.
A. What … that   B. That … what  C. Why … that   D. If … what
答案
1-5.CCCAD 6-10.ACBBA
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