whether if 的差別
- ElisaLv 71 0 年前最佳解答
When “whether” is the word to be used only, and NOT “if”:
(1) After Preposition:
We are concerned about whether John will be home safely from Iraq .
I will look into whether John would come.
The question of whether he should be fired needs more discussion.
(2) Before infinitives.
John cannot decide whether to join the Army or to attend the college.
When “whether” is preferred over “if”:
(1) When a question-word clause is a subject or complement, whether is preferred.
Whether I have time to work on it remains a question. (Subject)
The question is whether I will have time to work on it. (Complement)
(2) Whether is generally preferred to use with or.
We have not decided whether we will go to the party or not.
(3) Generally, whether is considered more formal than if.
Let me know whether you will accept the offer.
The head of our department will decide whether there is issue with investing in this product.
We will discuss whether he is suitable in this job.
Use if for a conditional idea, whether for an alternative or possibility.
Let me know if you'll be coming
=> meaning that I want to hear from you only if you're coming.
Let me know whether you'll be coming
=> meaning that I want to hear from you about your plans one way or the other"
(See Garner, The Oxford Dictionary of American Usage and Style).
When “whether” and “if” can be used interchangeably.
(1) Whether and if both can introduce indirect questions, a yes/no question.
I am concerned whether / if he can finish this in time.
I don't know if / whether I will have time.
He asked me whether/if I recover from the illness.
2008-11-10 03:24:09 補充：
"Whether" and "if" cannot always be used interchangeably.
2008-11-13 01:57:04 補充：
只是結論. I don't quite understand what you meant here.
Anyway, from grammar standpoint, if you see a preposition, you should use "whether" after the preposition. If you see an infinitive, you should "whether" before the infinitive.
2008-11-13 02:01:13 補充：
That is grammar. Kind of like why do you use singular verb tense for a single item and plural verb tense for multiple items in the present tense form. Can you say that there is no 文法觀點 for that?
2008-11-13 02:01:22 補充：
For example: John likes to eat fish. Both John and Mary like to eat fish.
Grammar is a rule.
Can you elaborate more on what you are trying to get at?
2008-11-13 05:53:13 補充：
To me, I would think that word usage is part of grammar too. But, it is just my opinion.
I survived the car car crash.
John was survived by his wife and two children. (Meaning that John was dead, leaving his wife and two children behind.)
2008-11-19 05:45:53 補充：
I survived the car crash.參考資料： Myself. Went abroad at age 11. With 32 years experience speaking and writing English. Tutored English as an Undergrad. A project manager in the US since 1992.