IF（英文单词）_百科资料

单词资料

1. (表示条件)如果

He will come if you invite him.

如果你请他，他会来的。

2. (表示虚拟)假如，要是

If I were you, I would never do that.

如果我是你，我决不做那件事。

3. (表示让步)即使

We'll go even if it rains.

即使下雨我们也要去。

4. 是否

I wonder if she is ill.

不知她是否病了。

5. (表示因果关系)每一次...的时候(总是会)

If I feel any doubt, I inquire.

我一感到有疑问就随时询问。

• n. 条件；设想

There are too many ifs in his offer.

他的提议中条件太多了。

缩写

IF=i.f.

if.

缩写词 abbr.

1. =information feedback 信息回馈

2. =interferon

3. =intermediate frequency 中频

扩展知识

1. if和whether在宾语从句中，都表“是否”，可换用，if更口语化，whether正式些。

当有or not时，一般用whether，而不用if。

He wants to know if/whether you can help him.

She wonders whether you'll go or not.

2. if可引起条件状语从句，whether不用于状语从句。

If you work hard, you'll succeed.

If I were you , I would do it in another way.

3. whether可引起主语从句，表语从句，if不能用于这两种情况。

Whether you can finish it in time or not depends on yourself.

The question is whether they'll help you.

4. if在名词性从句中只能引导动词后的宾语，whether可通用。

单词用法

依据《柯林斯英汉双解大词典》，意为：

1.CONJ You use if in conditional sentences to introduce the circumstances in which an event or situation might happen, might be happening, or might have happened. (引导条件从句) 如果

2. CONJ You use if in indirect questions where the answer is either "yes" or "no." (用于间接是非问句中) 是否

3. CONJ You use if to suggest that something might be slightly different from what you are stating in the main part of the sentence, for example, that there might be slightly more or less of a particular quality. (表示与主句所述事实可能有少许不同) 即使

4. CONJ You use if, usually with "can," "could," "may," or "might," in a conversation when you are politely trying to make a point, change the subject, or interrupt another speaker. 常与(can)、(could)、(may)、(might)等情态动词连用，表示婉转客气

5. CONJ You use if at or near the beginning of a clause when politely asking someone to do something. (用于从句句首或靠近句首的位置，表示礼貌的请求) 是否 [礼貌]

6. PHRASE You use if not in front of a word or phrase to indicate that your statement does not apply to that word or phrase, but to something closely related to it that you also mention. 即便不

7. CONJ You use if to introduce a subordinate clause in which you admit a fact that you regard as less important than the statement in the main clause. (引导从句，提出次要的事实) 即使

8. PHRASE You use if ever with past tenses when you are introducing a description of a person or thing, to emphasize how appropriate it is. (与过去式连用，强调对人或事物的描述极为恰当) 如果有…的话 [强调]

9. PHRASE You use if only with past tenses to introduce what you think is a fairly good reason for doing something, although you realize it may not be a very good one. 即使仅仅 (与过去式连用，引出能勉强说明做某事的原因)

10. PHRASE You use if only to express a wish or desire, especially one that cannot be fulfilled. (尤指不能实现的愿望) 要是…多好 [情感]

11. PHRASE You use as if when you are making a judgment about something that you see or notice. Your belief or impression might be correct, or it might be wrong. (表示判断) 好像

12. PHRASE You use as if to describe something or someone by comparing them with another thing or person. (表示类比) 仿佛

13. PHRASE You use as if to emphasize that something is not true. (强调某事不是真的) 好像…一样 [口语]