大家好,我是小新,我来为大家解答以上问题。whetheror not,whetheror很多人还不知道,现在让我们一起来看看吧!
1、一、whether和if都可以用作连词,引导一个名词性从句,表示“是否”。whether可以引导主语从句、表语从句、宾语从句和同位语从句;而if只能引导宾语从句。
2、1.引导宾语从句既可以用whether,也可以用if,两者常可以互换。whether从正反两个方面提出疑问,选择意义较强,多用于正式文体中;而if多用于口语,比较强调单方面,如:
3、He asked me whether / if I could lend him my bike.
4、Could you tell us whether / if it snows in winter in Australia?
5、I want to know whether / if you can come or not.
6、She asked them whether / if they had gone there by car or by train.
7、值得注意的是:
8、① whether 和if都可以和or not连用,但是whether之后可以直接跟or not,而if则不能,如:
9、I don’t care whether or not your car breaks down.
10、I don’t know whether or not he’s coming.
11、但是不可以说:
12、I don’t care if or not your car breaks down.
13、② whether引导的从句一般不可以为否定结构(选择问句的后一部分除外);而if则可以跟否定结构,如:
14、I don’t care if she doesn’t come.
15、I don’t care if it doesn’t rain.
16、但是,在某些动词或形容词之后,则可以用whether引导一个否定结构的句子,这种结构往往表示肯定的含义,如:
17、I wonder whether he doesn’t think too much of himself.
18、其意思相当于:I think he does think too much of himself.
19、③ 在个别动词之后,如discuss 等,只跟用whether引导的宾语从句,如:
20、They discussed whether they should close the shop.
21、We discussed whether Mary could join us.
22、④ whether 可以引导从句作介词的宾语,而if则不能,如:
23、I’m not interested in whether they’ll go or not.
24、It depends on whether we have got enough money.
25、⑤ whether可以直接跟动词不定式连用,而if则不能,如:
26、I didn’t know whether to laugh or to cry.
27、She hasn’t decided whether to go or not.
28、He was wondering whether to go home or stay at school.
29、2.引导主语从句(包括从句在句首的位置)应当用whether,不用if,如:
30、Whether it is true remains a problem.
31、Whether he can stay with us is another matter.
32、Whether he will come, I am not sure.
33、Whether or not he did it, I cannot tell.
34、3.引导表语从句用whether,不用if,如:
35、The question is whether you should accept it.
36、The question is whether he will speak at the meeting.
37、4.引导同位语从句用whether,不用if,如:
38、The question whether he’ll attend the meeting is essential.
39、I am in doubt whether I should agree to the plan.
40、二、whether 还可以引导让步状语从句,意为“不管;无论”;而if则不能引导这种从句,如:
41、I shall tell her about it whether you agree or not.
42、Whether or not the figures are accurate, we have to recheck them.
43、Whether or not we had a baby, we could not survive just on my salary.
44、三、if还可以引导条件状语从句,意为“如果;假如”,而whether则不能引导这种从句,如:
45、We shall do this experiment if we have time.
46、四、如果在从句中使用if表示“是否”容易与表示条件的状语从句混淆时,应注意避免使用if,例如:Please let us know if they are coming. 这句话可以理解为“如果他们要来,请通知我们一下。”也可以理解为“请告诉我们,他们是否要来。”若表示后一层意思,应当使用,以免引起误会。
本文到此讲解完毕了,希望对大家有帮助。