时间: 2025-04-24 20:15:03
美: [ɪf]
英: [ɪf]
conj. （表条件）如果；即使；是否；（表假设）假如
n. 条件；设想
最后更新时间:2025-04-24 20:15:03
词源分析： "if" 源自古英语单词 "gif"，意为“如果”。其词根可能与古日耳曼语 “gib” 相关，也在多种日耳曼语言中有类似形式。
历史背景： "if" 的首次使用可以追溯到古英语时期，广泛出现在早期的诗歌和散文中，如《贝奥武夫》（Beowulf）中就有使用。
课本：
正式与非正式语境：
特殊场合：
If it rains tomorrow, we will cancel the picnic.
如果明天下雨，我们将取消野餐。
I will go to the party if you invite me.
如果你邀请我，我就会去参加派对。
If you study hard, you will pass the exam.
如果你努力学*，你将通过考试。
If I were you, I would take that job.
如果我是你，我会接受那份工作。
If she had known about the meeting, she would have come.
如果她知道会议，她会来。
*. If the temperature drops below freezing, the water will turn to ice.
如果温度降到冰点以下，水会变成冰。
If you need help, just let me know.
如果你需要帮助，告诉我一声就行。
If we leave now, we’ll avoid the traffic.
如果我们现在离开，就能避开交通。
同义词：
反义词：
通过以上分析，用户可以更全面地理解与使用单词 "if"。
[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
例：She gets very upset if I exclude her from anything.如果有什么事我将她排除在外，她就会非常难过。
例：You can go if you want.如果你想走就走吧。
[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
例：He asked if I had left with you, and I said no.他问我是不是和你一起离开的，我说不是。
[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
例：Sometimes that standard is quite difficult, if not impossible, to achieve.有时那个标准，即使并非不可能，也是很难达到的。
[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
例：If I could just make another small point about the weightlifters in the Olympics.请允许我就奥运会的举重运动员们再稍说一句。
[[礼貌]] 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
例：I wonder if you'd be kind enough to give us some information, please?不知能否请您向我们提供些信息？
[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
例：She understood his meaning, if not his words, and took his advice.她即便不懂他的语言，也明白了他的意思，并且接受了他的建议。
[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
例：If there was any disappointment it was probably temporary.即使有任何遗憾，可能也是暂时的。
[[强调]] 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
例：I became a distraught, worried mother, a useless role if ever there was one.如果有个心烦意乱、忧心忡忡的母亲，一个完全无用的角色，那就是我。
[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)
例：She always writes me once a month, if only to scold me because I haven't answered her last letter yet.她总是一个月写一封信给我，即使仅仅是为了责备我还没有回她的上一封信。
[[情感]] 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
例：If only you had told me that some time ago.要是你之前告诉我那件事该多好。
[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
例：It looked as if she had forgotten how to breathe.她看上去好像是忘了如何呼吸似的。
[PHRASE] You use as if to describe something or someone by comparing them with another thing or person. (表示类比) 仿佛
例：He points two fingers at his head, as if he were holding a gun.他用两个手指对着自己的脑袋，仿佛正拿着一把枪。
[[口语]] You use as if to emphasize that something is not true. (强调某事不是真的) 好像…一样
例：Getting my work done! My God! As if it mattered.把我的活儿干完！我的天哪！好像这很要紧似的。