Do you know if he's married?他结婚没结婚，你知道吗？

I can give you a round neckpne if you prefer.如果您喜欢我可以给您开个圆领口。

If he wins and it's a big if he'll be the first Engpshman to win for twenty years.假使他赢了－－是否能赢还是一大疑问－－他将是二十年来第一个获胜的英国人。

She glares at me if I go near her desk.我一走近她的办公桌，她就瞪我。

Why not,if the conditions permit.如果条件允许，没什么不可以的。

If these terms are not acceptable to you, we may suggest others.如果你对这些条件不合意，我们可提出别的条件。

If she needs salvation, she will posit a savior.如果她需要救助，她就会设想一个救助者。

Imagine if everyone did just a few of these atonce?Here is my pst.设想一下每个人立刻做了其中的一些事情会如何。

If you demand his presence,warn him in advance.
如果你要他来,就事先通知他。

If you will be so kind as to help us, we can finish by six.
如果你愿意帮助我们,到六点时咱们就能完成了。

If you were a bird,you could fly.
如果你是鸟,你就能飞行了。

I should have talked to mother if I had thought of it.
如果当初我想到了,我就和妈妈说了。

If I were to ask him for a loan,would he agree ?
如果我向他借钱的话,他能同意吗?

If it should rain tomorrow,the rally would be postponed.
要是明天下雨,群众大会就会延期举行。

If I were an architect,I'd redesign this house.
如果我是建筑师,我会重新设计这房子。

If it were up there, it would be easier to find.
如果它在那儿,就会更容易被找到。

If had anything happened, he would have let me know.
如果当初发生了什么事,他会让我知道的。

If necessary, give me a ring.
如果需要,给我打个电话。

He will come, if invited.
如果受到邀请,他会来的。

If only somebody had told us, we could have warned you.
如果有人告诉了我们,我们就能事先提醒你。

We will go even if it rains.
即使下雨,我们也要去。

If he is poor, at least he is honest.
他虽然穷,但至少是诚实的。

I don't know if he was there.
我不知道他当初是否在那里。

I wonder if it is the right size.
我不知道尺寸是否合适。

I will see if he wants to talk to you.
我去了解一下他是否想和你谈话。

If I haven't repeated the mistake!
我真不该重犯这样的错误。

And if he didn't try to knock me down!
令人惊奇的是他竟没把我打倒。

If ever eyes could speak, hers did very plainly.
如果眼睛能说话,她的眼睛可说得清楚极了。

Peter is a lummox, if ever I saw one.
如果彼得不是笨蛋,那么在世界上就没有笨蛋了。

I shall call you again next week when or if I have a chance.
如果可能,下周我会再给你打电话。

I shall take you round America next year when, or if I get extra vacation.
如果我有多余的假期,明年我会带你去美国。

What if she found out that you've broken her necklace?
要是她发现你弄坏了她的项链,怎么办呢?

What if he was faithless to his friends and to his wife?
要是他对妻子和朋友不忠怎么办?

If only I know!
假如我知道那就好了。

If only he could arrive in time.
要是他能及时赶来就好了。

if作为从属连词,可引导条件状语从句、让步状语从句和名词从句。

if引导条件状语从句,从句可为真实条件从句,也可为虚拟条件从句。如为真实条件从句,谓语用陈述语气,表示可能性很大,作“假使”“如果”解,通常用一般现在时代替一般将来时; 如果if从句中用will,表示意愿。从句如为虚拟条件从句,谓语动词要用虚拟语气,表示可能性不大或与过去事实相反,作“要是,假如”解。可指过去的情况,也可指现在和将来的情况。指将来情况时可用were to或should。在现代口语中,一、三人称后常用was代替were。if引导的虚拟条件句中,助动词were,should,had可以移至主语前,此时if可省略。

if引导的条件从句中可以省略be和主语。

if引导的条件从句,有时后接only以加强其语气,表示说话人非常盼望某人提出的条件能够实现。

if可引导让步状语从句,作“虽然,即使”解,常和even连用。

if可引导名词性从句,作“是否”解,常放在ask, doubt, know, learn, see, wonder等动词后。一般用在口语中,而且不能用于句首。

if可以表示惊奇或愤怒。用于陈述语气的否定句时,意义则是肯定的。

If ever...在现代英语中,表示强调,用于加强主句的意思,往往含有否定意思。

When or if〔when, or if〕表示从句所说的也许不会实现。

if any的意思是“如果有的话”。

if only可表示对现时或未来的愿望,也可表示与过去事实相反的愿望,作“只要…但愿,要是…就好了”解。

What will happen if...?意思是“要是…怎么办”。常缩略成What if...?

If not后可加动词,通常动词省略,可用于现在时态或现在完成时态,表示“要不,不然”; 也可用于yes〔no〕疑问句之后,表示“许诺,告诫”。

误 I wonder if she found something.

正 I wonder if she found anything.

析 if引导的从句中,通常用any, anything, anybody, anywhere作从句的宾语,而不用some, something, somebody, somewhere。

Do you know if he's married?他结婚没结婚，你知道吗？

I can give you a round neckpne if you prefer.如果您喜欢我可以给您开个圆领口。

If he wins and it's a big if he'll be the first Engpshman to win for twenty years.假使他赢了－－是否能赢还是一大疑问－－他将是二十年来第一个获胜的英国人。

She glares at me if I go near her desk.我一走近她的办公桌，她就瞪我。

Why not,if the conditions permit.如果条件允许，没什么不可以的。

If these terms are not acceptable to you, we may suggest others.如果你对这些条件不合意，我们可提出别的条件。

If she needs salvation, she will posit a savior.如果她需要救助，她就会设想一个救助者。

Imagine if everyone did just a few of these atonce?Here is my pst.设想一下每个人立刻做了其中的一些事情会如何。

If you demand his presence,warn him in advance.
如果你要他来,就事先通知他。

If you will be so kind as to help us, we can finish by six.
如果你愿意帮助我们,到六点时咱们就能完成了。

If you were a bird,you could fly.
如果你是鸟,你就能飞行了。

I should have talked to mother if I had thought of it.
如果当初我想到了,我就和妈妈说了。

If I were to ask him for a loan,would he agree ?
如果我向他借钱的话,他能同意吗?

If it should rain tomorrow,the rally would be postponed.
要是明天下雨,群众大会就会延期举行。

If I were an architect,I'd redesign this house.
如果我是建筑师,我会重新设计这房子。

If it were up there, it would be easier to find.
如果它在那儿,就会更容易被找到。

If had anything happened, he would have let me know.
如果当初发生了什么事,他会让我知道的。

If necessary, give me a ring.
如果需要,给我打个电话。

He will come, if invited.
如果受到邀请,他会来的。

If only somebody had told us, we could have warned you.
如果有人告诉了我们,我们就能事先提醒你。

We will go even if it rains.
即使下雨,我们也要去。

If he is poor, at least he is honest.
他虽然穷,但至少是诚实的。

I don't know if he was there.
我不知道他当初是否在那里。

I wonder if it is the right size.
我不知道尺寸是否合适。

I will see if he wants to talk to you.
我去了解一下他是否想和你谈话。

If I haven't repeated the mistake!
我真不该重犯这样的错误。

And if he didn't try to knock me down!
令人惊奇的是他竟没把我打倒。

If ever eyes could speak, hers did very plainly.
如果眼睛能说话,她的眼睛可说得清楚极了。

Peter is a lummox, if ever I saw one.
如果彼得不是笨蛋,那么在世界上就没有笨蛋了。

I shall call you again next week when or if I have a chance.
如果可能,下周我会再给你打电话。

I shall take you round America next year when, or if I get extra vacation.
如果我有多余的假期,明年我会带你去美国。

What if she found out that you've broken her necklace?
要是她发现你弄坏了她的项链,怎么办呢?

What if he was faithless to his friends and to his wife?
要是他对妻子和朋友不忠怎么办?

If only I know!
假如我知道那就好了。

If only he could arrive in time.
要是他能及时赶来就好了。

• whether