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if

美 [ɪf]
英 [ɪf]
  • conj.如果;当;倘若;假若
  • n.不确定的情况
  • 网络假如;条件;是否
复数:ifs  
If
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conj.
1.
如果;假若;倘若used to say that one thing can, will or might happen or be true, depending on another thing happening or being true
If you see him, give him this note.
你要是见到他,就把这个便条给他。
I'll only stay if you offer me more money.
你给我更多的钱我才会留下。
If necessary I can come at once.
如果有必要,我可以马上来。
You can stay for the weekend if you like.
你如果愿意就留在这里过周末吧。
If anyone calls, tell them I'm not at home.
要是有人打电话来,就说我不在家。
If he improved his IT skills, he'd(= he would) easily get a job.
他如果提高了自己的 IT 技能,就会容易找到工作。
You would know what was going on if you'd(= you had) listened.
你若是注意听了就会知道发生什么事了。
They would have been here by now if they'd caught the early train.
假若他们赶上了早班火车,现在就该到这里了。
If I was in charge, I'd do things differently.
假若由我负责,我不会这样办事的。
If I were in charge…
假若由我负责…
Even if(= although) you did see someone, you can't be sure it was him.
即使你确实看见有个人,也不能保证那就是他。
2.
当;无论何时;每次when; whenever; every time
If metal gets hot it expands.
金属受热就膨胀。
She glares at me if I go near her desk.
我一走近她的办公桌,她就对我瞪眼。
3.
(与 will 或 would 连用,表示客气地请求)used withwill orwould to ask sb politely to do sth
If you will sit down for a few moments, I'll tell the manager you're here.
请稍坐,我这就告诉经理说您来了。
If you would care to leave your name, we'll contact you as soon as possible.
麻烦您留下姓名,我们会尽快与您联系的。
4.
(用于 ask、know、find out、wonder 等之后,引出两个或以上的可能性之一)是否used afterask ,know ,find out ,wonder , etc. to introduce one of two or more possibilities
Do you know if he's married?
你知道他是否结婚了?
I wonder if I should wear a coat or not.
我不知道该不该穿外套。
He couldn't tell if she was laughing or crying.
他弄不清楚她是在笑还是在哭。
Listen to the tune and see if you can remember the words.
听听曲调,看你能否记起歌词。
5.
(用于表示情感的动词或形容词之后)used after verbs or adjectives expressing feelings
I am sorry if I disturbed you.
很抱歉,打搅您了。
I'd be grateful if you would keep it a secret.
你如果能对此保密,我将不胜感激。
Do you mind if I turn the TV off?
我关上电视可以吗?
6.
(承认某事可能,但不很重要)即使,虽然used to admit that sth is possible, but to say that it is not very important
If she has any weakness, it is her Italian.
如果要说她有什么缺点,那就是她的意大利语不大行。
So what if he was late. Who cares?
他就是迟到了又怎么样。谁在乎?
7.
(置于形容词之前,引出对比)虽然,尽管used before an adjective to introduce a contrast
He's a good driver, if a little over-confident.
他是个好司机,虽然有点过于自信。
We'll only do it once─ if at all .
我们就是干也只会干一次。
8.
(请对方听自己的意见)used to ask sb to listen to your opinion
If you ask me, she's too scared to do it.
依我看,她被吓得不敢做了。
If you think about it, those children must be at school by now.
想想吧,那些孩子现在一定在学校了。
If you remember, Mary was always fond of animals.
记得吧,玛丽总是喜欢动物。
9.
(置于 could、may 或 might 之前,提出建议或客气地打断别人的话)used beforecould ,may ormight to suggest sth or to interrupt sb politely
If I may make a suggestion, perhaps we could begin a little earlier next week.
我来提个建议吧,或许我们下个星期可以早一点开始。
IDM
If and when we ever meet again I hope he remembers what I did for him.
倘若我们再次见面,我希望他还记得我为他做的事。
if and when
(谈及可能发生或不发生的事时说)used to say sth about an event that may or may not happen
If and when we ever meet again I hope he remembers what I did for him.
倘若我们再次见面,我希望他还记得我为他做的事。
I'd say he was more like his father, if anything.
依我看,如果一定要说他像谁的话,他比较像他的父亲。
She's not thin─if anything she's on the plump side.
她并不瘦,其实她还有点胖呢。
if anything
(表达看法,或用在否定句之后表示反面意见才对)used to express an opinion about sth, or after a negative statement to suggest that the opposite is true
I'd say he was more like his father, if anything.
依我看,如果一定要说他像谁的话,他比较像他的父亲。
She's not thin─if anything she's on the plump side.
她并不瘦,其实她还有点胖呢。
If I were you I'd start looking for another job.
我要是你,就会去另找工作了。
if I were you
(提出劝告时说)used to give sb advice
If I were you I'd start looking for another job.
我要是你,就会去另找工作了。
I'll go if you're going. If not(= if you are not) I'd rather stay at home.
你去我就去。不然的话,我宁愿待在家里。
Are you ready? If not, I'm going without you.
你准备好了吗?否则我就自己去了。
Do you want that cake? If not, I'll have it.
你要那块蛋糕吗?不然我就要了。
They cost thousands if not millions of pounds to build.
建设要耗费数千英镑,甚至可能是数百万英镑。
if not
(用在 if 引导的句子之后)不然,要不used to introduce a different suggestion, after a sentence withif
I'll go if you're going. If not(= if you are not) I'd rather stay at home.
你去我就去。不然的话,我宁愿待在家里。
(用于 yes ╱ no 疑问句之后,表示如果答案是 no,将会或应该发生什么)used after ayes/no question to say what will or should happen if the answer is ‘no’
Are you ready? If not, I'm going without you.
你准备好了吗?否则我就自己去了。
Do you want that cake? If not, I'll have it.
你要那块蛋糕吗?不然我就要了。
(表示可能更大或更重要等)used to suggest that sth may be even larger, more important, etc. than was first stated
They cost thousands if not millions of pounds to build.
建设要耗费数千英镑,甚至可能是数百万英镑。
If only I were rich.
但愿我很富有。
If only I knew her name.
我要是知道她的名字就好了。
If only he'd remembered to send that letter.
要是他没忘记发那封信就好了。
If only I had gone by taxi.
我要是乘出租车去就好了。
if only
但愿used to say that you wish sth was true or that sth had happened
If only I were rich.
但愿我很富有。
If only I knew her name.
我要是知道她的名字就好了。
If only he'd remembered to send that letter.
要是他没忘记发那封信就好了。
If only I had gone by taxi.
我要是乘出租车去就好了。
I'm surprised they've invited me to their wedding─it's not as if I know them well.
我很惊讶他们居然请我参加他们的婚礼,我跟他们似乎并不熟。
its not as if
(表示所发生的事情令人惊讶)used to say that sth that is happening is surprising
I'm surprised they've invited me to their wedding─it's not as if I know them well.
我很惊讶他们居然请我参加他们的婚礼,我跟他们似乎并不熟。
Only if a teacher has given permission is a student allowed to leave the room.
学生只有得到老师的许可才能离开教室。
Only if the red light comes on is there any danger to employees.
只有红灯闪亮时才有危及职工的险情。
only if
只有used to state the only situation in which sth can happen
Only if a teacher has given permission is a student allowed to leave the room.
学生只有得到老师的许可才能离开教室。
Only if the red light comes on is there any danger to employees.
只有红灯闪亮时才有危及职工的险情。
n.
1.
(informal)
不确定的情况a situation that is not certain
If he wins─and it's a big if ─he'll be the first Englishman to win for fifty years.
假设他赢了 — 不过这还是个很大的疑问 — 他将成为五十年以来第一个获胜的英格兰人。
There are still a lot of ifs and buts before everything's settled.
在一切得以解决之前还有很多不确定因素。

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