考点3. whether 与if引导名词性从句时的区别
A. 在主语从句、表语从句、同位语从句中只能用whether,不能用if。
Whether the meeting will be put off has not been decided yet.
The question is whether they have so much money.
We ought to discuss carefully the question whether we can do it or not.
B. 在宾语从句中whether和if可以互换,但:
i. 作介词宾语时连接词一般用whether。如:
It all depends on whether they will come back.
ii. 后面直接跟or not 时用whether。如:
I didn’t know whether or not he had arrived in Wuhan.
C. whether也可与动词不定式连用,但if不能。
I have not decided whether to go or not.
D. whether常与or连用表示一种选择,if不能这样用:
The question of whether they are male or female is not important.
E. whether可引导一个让步状语从句表示“不管”、“无论”,而if不能。如:
Whether he comes or not, we will begin our party on time.
F. discuss后通常用whether。
15. ______ you can succeed in the end will mainly depend on ______ you do and ______ you do it.
A. If; what; why B. Whether; what; how
C. Whether; how; why D. That; whether; how
16. 【2009上海】It is not immediately clear ______ the financial crisis will soon be over.
A. since B. what C. when D. whether
17. They discussed ______ they could settle the problem without others’ help.
A. if B. that C. what D. whether
18. What the doctor is uncertain about is ______ my mother will recover from the serious disease soon.
A. when B. how C. whether D. why
19. Mr. Hopkins has not yet answered my question ______ I can go with him to ______ he calls the Underground Treasure House next week.
A. that; which B. that; where
C. whether; that D. whether; what
20. I have no idea ______ or not he has finished the work.
A. if B. that C. whether D. which
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