if

if 基本解释

conj.  如果; 假若; 倘若; 当; 无论何时; 每次; 与will或would连用，表示客气地请求
n.  不确定的情况

中考高考计算机CET4考研

if 词组短语

• double tuned if and r-famplif-ier
• compound IF statement
• logical IF statement
• if canceller
• if then else
• full premium if lost
• what-if
• what-if analysis
• FORTRAN IF
• nested block IF statement

if 详细解释

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
   1. If you see him, give him this note.
      你要是见到他，就把这个便条给他。
   2. I'll only stay if you offer me more money.
      你给我更多的钱我才会留下。
   3. If necessary I can come at once.
      如果有必要，我可以马上来。
   4. You can stay for the weekend if you like.
      你如果愿意就留在这里过周末吧。
   5. If anyone calls, tell them I'm not at home.
      要是有人打电话来，就说我不在家。
   6. If he improved his IT skills, he'd (= he would) easily get a job.
      他如果提高了自己的信息技术技能，就会容易找到工作。
   7. 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。
   8. 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。
   9. If I was in charge, I'd do things differently.
      假若由我负责，我不会这样办事的。
   10. If I were in charge…
       假若由我负责…
   11. 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
   1. If metal gets hot it expands.
      金属受热就膨胀。
   2. 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 with will or would to ask sb politely to do sth
   1. 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。
   2. 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 after ask , know , find out , wonder , etc. to introduce one of two or more possibilities
   1. Do you know if he's married?
      你知道他结婚了吗？
   2. I wonder if I should wear a coat or not.
      我不知道该不该穿外套。
   3. He couldn't tell if she was laughing or crying.
      他弄不清楚她是在笑还是在哭。
   4. 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
   1. I am sorry if I disturbed you.
      很抱歉，打搅您了。
   2. 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。
   3. 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
   1. 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。
   2. 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
   1. He's a good driver, if a little over-confident.
      他是个好司机，虽然有点过于自信。
   2. 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
   1. If you ask me, she's too scared to do it.
      依我看，她被吓得不敢做了。
   2. 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。
   3. 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，以提出建议或客气地打断别人的话）
   used before could , may or might to suggest sth or to interrupt sb politely
   1. 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。

noun

1. 不确定的情况
   a situation that is not certain
   1. 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。
   2. 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定因素。

if 习惯用语

conj.

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
  1. 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 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
  1. 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。
  2. 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

• （提出劝告时说）
  used to give sb advice
  1. If I were you I'd start looking for another job.
     我要是你，就会去另找工作了。

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 with if
  1. 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 a yes/no question to say what will or should happen if the answer is ‘no’
  1. Are you ready? If not, I'm going without you.
     你准备好了吗？否则我就自己去了。
  2. 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
  1. 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

• 但愿
  used to say that you wish sth was true or that sth had happened
  1. If only I were rich.
     但愿我很富有。
  2. If only I knew her name.
     我要是知道她的名字就好了。
  3. If only he'd remembered to send that letter.
     要是他没忘记发那封信就好了。
  4. If only I had gone by taxi.
     我要是乘出租车去就好了。

it's 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
  1. 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

• 只有
  used to state the only situation in which sth can happen
  1. 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。
  2. 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。

if 双语例句

1. 1、 She gets very upset if I exclude her from anything
   要是有什么事情我不让她参加，她会非常难过。
2. 2、 You'll feel a lot better about yourself if you work on solutions to your upsetting situations
   如果你设法找到解决自己麻烦的办法，你自我感觉会好得多。
3. 3、 You can go if you want
   你要是想走就可以走。
4. 4、 if you would like to send a donation to Cobuild, please enclose a cheque with your coupon
   如果你想为Cobuild语料库捐款，请随订货单附上支票。
5. 5、 if you went into town, you'd notice all the pubs have loud jukeboxes
   如果你进了城，你会注意到所有的酒吧都有音量很大的自动点唱机。
6. 6、 What I did was right and if I had done anything less it would have been wrong
   我做的一切都是正确的，如果我少做了一点点，就会出错。
7. 7、 Fry remaining peppers, adding a little more dressing if necessary
   用油炸一下剩下的辣椒，如果需要再加点调味汁。
8. 8、 Do you have a knack for coming up with ideas? if so, we would love to hear from you.
   你有什么能想出好点子的诀窍吗？如果有，我们很愿意收到你的来信。
9. 9、 He asked if I had left with you, and I said no
   他问我是否和你一块儿离开的，我说不是。
10. 10、 I wonder if I might have a word with Mr Abbot?
    请问我能否和阿博特先生说几句话？
11. 11、 Sometimes, that standard is quite difficult, if not impossible, to achieve
    有时即便有可能达到那个标准，那也是非常困难。
12. 12、 I'm working on my fitness and I will be ready in a couple of weeks, if not sooner
    我正在调养身体，最多两三周以后就可以了。
13. 13、 Many, if not most, scientific papers are presented orally at scientific meetings
    许多科学论文，即便不是大多数，都是以口头形式在科学会议上发表的。
14. 14、 What one quality, if any, do you like the most about your partner?
    你最喜欢你伴侣的哪一点，假如有的话？
15. 15、 Meat was available once a week if at all.
    就算有肉，也是每周才吃一次。
16. 16、 if I could just make another small point about the weightlifters in the Olympics
    请允许我就有关奥运会举重运动员的问题再补充一点。
17. 17、 Well, it's the old argument Max, which is a bit ridiculous if you don't mind me saying so
    哦，马克斯，又是那个很老套且有点儿荒谬的争论，如果你不介意我这么说的话。
18. 18、 Well if you want my opinion, unless you do it soon you're gonna lose the opportunity and you'll be really sorry.
    如果你想听我的意见，你应该尽快做那事，否则你会失去机会，并且会非常遗憾。
19. 19、 I wonder if you'd be kind enough to give us some information, please?
    请问您能不能给我们提供一些信息？
20. 20、 if there was any disappointment it was probably temporary
    即便有点儿失望，也肯定是暂时的。
21. 21、 A number of recent advances hold out if not the hope of a cure, then at least the possibility of some drug which could stop the spread of the virus
    近来的一些进展即使不能提供治愈的希望，也至少有望研制出来某种药物来阻止病毒的传播。
22. 22、 I became a distraught, worried mother, a useless role if ever there was one
    我变成了一个忧心如焚的母亲，一个全无用处的角色。
23. 23、 She writes me often, if only to scold me because I haven't written to her
    她常来信，即使仅仅为了责怪我还没回信给她。
24. 24、 if only you had told me that some time ago
    要是你早些时候告诉我该多好啊！
25. 25、 The whole room looks as if it has been lovingly put together over the years
    整个房间看起来好像是经过了多年的精心布置。
26. 26、 He points two fingers at his head, as if he were holding a gun
    他把两根手指指向他的头，仿佛他正举着一支枪。
27. 27、 My husband, for some unknown reason, suggested that I loved my birds more than him: as if I would
    我丈夫，莫名其妙地，暗示我爱鸟甚于爱他：仿佛我真如此似的。
28. 28、 Living together didn't harm our friendship. if anything it strengthened it
    在一起住并没有损害我们的友谊。要说真有什么的话，它反而巩固了我们的友谊。
29. 29、 I am surprised by the fuss she's making. It's not as if my personality has changed.
    她的大惊小怪令我很吃惊。显然不是我的个性改变了。
30. 30、 if I were you, Mrs Gretchen, I just wouldn't worry about it
    要是我是你，格蕾琴夫人，我一点都不会担心。