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BNC: 40 COCA: 40
Contents
  1. conjunction
    2. IN THAT SITUATION
    WHETHER
    REQUEST
    Idiom(s)
  2. noun
    3. Idiom(s)
ifconjunctionuk/ɪf/ us/ɪf/

if conjunction IN THAT SITUATION

A2 used to say that a particular thing can or will happen only after something else happens or becomes true假如，如果

I'll pay you double if you get the work finished by Friday.如果你周五前完工，我付你雙倍的報酬。
We'll have the party in the garden if the weather's good. If not (= if the weather is not good), it'll have to be inside.如果天氣好的話，我們將在花園裏開派對。如果不好，就只好在室内了。
If anyone calls, just say I'll be back in the office at four o'clock.要是有人給我打電話，請告訴他們我4點鐘回辦公室。
If she hadn't called, I wouldn't have known.要不是她打來電話，我還不知道呢。
I wouldn't work for them (even) if they paid me twice my current salary.即使他們付給我的工資是現在的兩倍，我也不會爲他們幹活。
We'll deal with that problem if and when it arises.等到那個問題出現我們再處理。
If disturbed, the bird may abandon the nest, leaving the chicks to die.如果受到驚擾，鳥可能會棄巢而去，留下雛鳥，任由它們死亡。

although雖然，即使

They're great kids, even if they can be demanding.雖然他們要求多多，但他們是很好的孩子。
literary It was a hot, if windy day.那天雖然有風，卻依然很熱。

B1 every time當，每當

If water is heated to 100°C it turns to steam.水被加熱到100攝氏度時，就會變成蒸汽。
If I don't get enough sleep I get a headache.我睡眠不足時就會頭疼。

used to mean "if it is true that"如果…是真的

I'm very sorry if I've offended you.如果我冒犯了你的話，我很抱歉。

More examples

You'll feel cold if you don't wear a coat.

You have to go to college for a lot of years if you want to be a doctor.

Try to act confidently, even if you feel nervous.

The TV won't work if the aerial's not connected.

Biscuits will stay crisp if you keep them in an airtight container.

if conjunction WHETHER

B1 used to introduce a clause, often in indirect speech, that shows two or more possibilities（用於引出從句，常爲間接引語）是否

Mrs Kramer called half an hour ago to ask if her cake was ready.克雷默夫人半小時前來電話問她的蛋糕做好了沒有。
I don't care if he likes it or not - I'm coming!我不在乎他樂不樂意，我反正要來！
I was wondering if you'd like to come to the cinema with me this evening?不知你今晚想不想與我一起去看電影？
Compare
whether

More examples

I must see if my flatmate has paid those bills yet.

We asked if the computer could access the internet.

You could always call Susie and see if she might babysit.

I asked if she'd like to come out with us tonight.

I couldn't find the station, so I asked someone if they could direct me.

if conjunction REQUEST

used when you want to make a polite request or remark（用於禮貌地作出請求或評論）

If you'd like to take a seat, Mr Chang will be with you in a moment.您請先坐一會兒吧，張先生一會兒就過來。
Would you mind if I open/opened (= can I open) the window?我開窗您介意嗎？
There are, if you don't mind me saying so, one or two problems with this plan.恕我冒昧，我覺得這個計劃有一兩處問題。

Idiom(s)

if and when
if I were you
if need be
if you will
ifnoun [ C usually singular ]uk/ɪf/ us/ɪf/ informal

something that is not certain or not yet decided不確定因素；未決之事；疑問

There's a big if hanging over the project (= it is uncertain whether the project will happen).這個計劃能否啓動仍然懸而未決。

Idiom(s)

no ifs or buts
BNC: 40 COCA: 40
BNC: 40 COCA: 40
BNC: 40 COCA: 40
if
Conjunctions: albeit, although, and...
Arguments: argument, disagreement, conflict...
Not likely to happen: unlikely, doubtful, remote...

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