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动漫六头身是多少岁 2024-11-09 10:07:31

if英语知识

发布时间: 2022-12-12 15:41:32

㈠ if句型的用法总结英语用法

我们更好地了解if这个 英语单词 ,也更好地掌握它的用法。以下是我为大家整理了if句型的用法,希望能帮助大家更好地掌握if句型,提高英语水平。

if句型的用法1:引导条件状语从句

一、if作为连词,引导条件状语从句,它表示的意思是“假如”“如果”等。在复合句中如果主句用将

来时,则if引导的状语从句用一般现在时。例如:

1. If itdoesn’train, we will go to the park next Sunday. 如果天不下雨,下周星期天我们将去公园。

2. If you ask him,he will help you.如果你求他,他将会帮助你。

if句型的用法2:引导让步状语从句

二、if还可以引导让步状语从句。这时if当作“即使是”,“虽说”解。例如:

1. If she’s poor,at least she’s honest. 虽说她很穷,但至少她还是诚实的。

2. I’ll do it, even if it takes me all the afternoon. 虽然会花费我一下午的时间,我还是要做这事。

3. If I am wrong,you are wrong, too. 即使说我错了,那么你也不对。

if句型的用法3:引导时间状语从句

三、if引导时间状语从句,当if做“当”或“无论何时”解而不含有条件之义时,if从句中的时态与主句中的时态相同。例如:

1. If youmix yellow and blue,you get green.你将黄色与蓝色混合,便会得到绿色。

2. If she wants the servant,she rings the bell.每当她需要仆人时,她便按铃。

>>>下一页更多精彩“if句型的用法”

㈡ 有什么关于if的英语语法知识

if是英语中出现频率很高的连词,并且它的用法也很多。学生感到很难掌握,为了让同学们更多更好地了解其用法及其语法功能。现结合教学中遇到的情况,予以归纳,以供参考。 一、if作为连词,引导条件状语从句,它表示的意思是“假如”“如果”等。在复合句中如果主句用将 来时,则if引导的状语从句用一般现在时。例如: 1. If itdoesn’train, we will go to the park next Sunday. 如果天不下雨,下周星期天我们将去公园。 2. If you ask him,he will help you.如果你求他,他将会帮助你。 二、if还可以引导让步状语从句。这时if当作“即使是”,“虽说”解。例如: 1. If she’s poor,at least she’s honest. 虽说她很穷,但至少她还是诚实的。 2. If I am wrong,you are wrong, too. 即使说我错了,那么你也不对。 3. I’ll do it, even if it takes me all the afternoon. 虽然会花费我一下午的时间,我还是要做这事。 三、if作为连词还可以引导宾语从句。引导宾语从句时和whether意思相同。例如: 1. Lily asked if / whether she liked it. 莉莉问她是否喜欢它。 2. She asked if / whether they had a cotton one. 她问是否他们有一件棉织的。 四、if引导时间状语从句,当if做“当”或“无论何时”解而不含有条件之义时,if从句中的时态与主句中的时态相同。例如: 1. If youmix yellow and blue,you get green.你将黄色与蓝色混合,便会得到绿色。 2. If she wants the servant,she rings the bell.每当她需要仆人时,她便按铃。 五、if后接否定动词,用于感叹句中,表示沮丧、惊奇等。例如: I. Well,if I haven’t left my false teeth at home!真倒霉,我把假牙丢在家里了! 2. And if he didn’t try to knock me down!(What do you think he did!He tried knock me down!)你猜他想做什么?他想把我撞倒! 六、用于虚拟语气中,if从句中用过去式,表示不可能实现,大概不会实现或提出作为考虑的假定条件。例如: 1. If you were a bird, you could fly.假使你是只鸟,你便会飞了。 2. If I asked him(if I were to ask him) for a loan,would he agree?如果我向他借贷,他会答应吗? 另外,if从句中用过去完成式,表示过去未实现的条件(例如由于不可能实现或某人之未能实行)。例如: 1. If they had startedearlier,they would have arrivedin time.要是他们早些动身,他们便可及时到达了。 2. If they had not started when they did,they would not be here now.如果他们那时不动身,现在他们就不会在此地了。 第三,在文学体栽中,if有时可省略,然后将主语与所用的限定动词(尤其是were,had,should)倒置。例如: 1. Should it (=if it should)be necessary,I will go. 倘若有必要,我会去的。 2. Were I(=if I were) in your place,I would do the same . 如果我处于你的位置,我也会这样干的。 3. Had I(=if I had)known earlier,I would come.如果我早一点知道,我就会来。 七、if与其它一些介词的连用。 首先,as与if连用,它的意思是:“仿佛、好像”同样引导从句。例如: 1. It isn’t as if we are rich.(We are not rich.)我们不像富有的样子。(即我们不富有) 2. It isn’t as if he doesn’t know the ruler.(i.e.He does know the rulers.)他不像不懂规则的样子。(即他懂得规则) 另外as if还可以引导感叹句。例如: As if I would allow it!(i.e.I would certainly not allow it!)好像我会答应似的!(我才不会答应哩!) 其次, if与only连用。常表示愿望或一个未实现的条件,尤其用于感叹句中。例如: 1. If only he arrives in time!他若能及时到达就好了! 2. If only she would marry me!但愿她能嫁给我! 3. If only she had known about it!(But she didn’t know.) 她那时要是知道(但她不知道)这事就好了! 详见: http://www.rye.net/syy/zxyy/200812/10896.html

㈢ 英语中if的用法归纳总结

IF是一个英语单词,名词、连词,作名词时意思是“条件,设想;不确定的情况”,作连词时意思是“(表条件)如果;(表假设)要是,假如;无论何时;虽然,即使;(用于间接疑问)是否;(用于礼貌问询)是否;当,每次;(与情态动词连用)表婉转客气;这不是……,要是……多好;或许不;就算;尽管”。

(3)if英语知识扩展阅读

if从句和虚拟语气:

1. 当if后面接一般现在时的动词时,表示对将来的一种推测. if sb do sth sb will/shall do sth. If you go with me, you shall be rewarded.

2. 当if后面接一般过去时的动词时,则是一种虚拟语气. if sb did sth sb would/should do sth. If I didnt make that mistake, I wouldt have suffered such a failure.

3. 当if后面接什么时态都可以时,if为“是否”的意思,句子为宾语从句. sb do sth if sb do sth. He said if rain was stop. 由if引导的条件状语从句,时态应该是主将从现,就是说主句用一般将来时,而从句用一般现在时表示将来。

例如 If it doesnt rain tomorrow, I will visit my former school. 这里从句就用一般现在时。当然if引导的从句也可以用虚拟语气

If I got up early in the morning, I wouldnt miss the train.如果我早上起得早,我就不会误了火车。

㈣ 英语if的用法

一、if作为连词,引导条件状语从句,表示“如果”等.在复合句中如果主句用将
来时,则if引导的状语从句用一般现在时(最基本的).
eg.If it doesn’t rain,we will go to the picnic next Sunday.如果天不下雨,下周日我们将去野餐.二、if还可以引导让步状语从句.在意义上相当于even if,even though或although.这时 if 意为“即使 是”,“虽然”.
eg.I’ll do it,even if it takes me a long time. 虽然会花费很长时间,我还是要做这事.If he is little,he is strong.他年纪虽小,力气倒大
三、if作为连词还可以引导宾语从句.引导宾语从句时和whether意思相同.例如:
eg.She asked if / whether I like it. 她问我是否喜欢它.* 此时注意:1.or not放在whether之后时,只能用whether不用if.2.在强调任意选择时,用whether…or,此时不用if替换whether 3.虽引导宾语从句,但为了强调宾语部分,也可把从句放在句首,此时只用whether 不用if .4.从句作介词宾语时只用whether不用if.5.作discuss等动词的宾语时,用whether不用if.6.句子中有if引导的条件句,如再有表示“是否”的宾语从句,用whether不用if 7.容易产生歧义时用whether不用if来表示“是否”.基本上碰到选择 if 还是 whether 的问题时都选 whether,除了一条:如果宾语从句为否定句时,则 只用if不用whether.eg.I don’t know if it won't rain tomorrow..我不知道明天是不是会下雨 四、if引导时间状语从句,意为“当”或“无论何时”,不含有条件之义时,if从句中的时态与主句中的时 态相同.
eg.If you mix yellow and blue,you get green.你将黄色与蓝色混合,便会得到绿色.
五、if后接否定动词,用于感叹句中,表示沮丧、惊奇等.例如:
eg.Well,if I haven’t left my homework at home!真倒霉,我把作业落在家里了!
六、用于虚拟语气中,if从句中用过去式,表示不太可能实现或提出作为考虑的假设条件.eg.
1.If I were a bird,I could fly.如果我是只鸟,我就会飞了.
2.If I asked him(if I were to ask him) for a loan,would he agree?如果我向他借款,他会答应吗?
另外,if从句中用过去完成式,表示过去未实现的条件.eg.
1.If they had started earlier,they would have arrived in time.要是他们早些动身,他们便可及时到达了.
2.If they had not started at that time,they would not be here now.如果他们那时不动身,现在他们就不会在此地了.
第三,if 条件句的虚拟有时可省略,然后将主语与所用的限定动词(were,should,had)倒置.eg.
1.Should it (=if it should) be necessary,I will go.倘若有必要,我会去的.
2.Were I(=if I were) in your post,I would do the same . 如果我处于你的位置,我也会这样干的.
3.Had I(=if I had)known earlier,I wouldn't go.如果我早一点知道,我就会不会走了.
七、if与其它一些介词的连用.
as与if连用,意思是:“仿佛、好像”同样引导从句.eg.It isn’t as if he doesn’t know the rules.(ie. He does know the rulers.)他不像不懂规则的样子.(即他懂得规则) (ie=namely=that is to say=in other words:“即,那就是说”)
另外as if还可以引导感叹句.例如:
As if I would allow it!(ie.I would certainly not allow it!) 好像我会答应那样!(我才不会答应呢!)
* if与only连用.表示“如果...就好了”.例如:
1.If only he arrives in time!他若能及时到达就好了!
2.If only she had known about it!(But she didn’t know.)她那时要是知道(但她不知道)这事就好了!* 此时注意区别 only if...:“只要...”,相当于“if” eg.Only if you word hard,you'll be successful one day.

㈤ 英语If用法

if最常见的用法,就是用来表达“假如、如果”的意思。if还有另外一个用法,那就是“是否”的意思,跟whether用法差不多,用于引出从句。

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㈥ 初中英语if用法归纳分点回答

if的用法:表示条件,意思是如果;表示虚拟,意思是假如;表示是否的含义,和whether相同用法,连接宾语从句。

(6)if英语知识扩展阅读

用法:

1、(表示条件)如果 ,主句用将来时,if从句用现在时表示将来

He will come if you invite him.

如果你请他,他会来的.

2、(表示虚拟)假如,要是

时态:可以表示过去,现在和将来的`情况.它的基本特点是时态退后.

a.同现在事实相反的假设.

句型 :条件从句 主句

一般过去时 should( would) +动词原形

If they were here,they would help you.

b.表示于过去事实相反的假设.

句型:条件从句 主句

过去完成时 should(would) have+ 过去分词

If she had worked harder,she would have succeeded.

The rice would not have been burnt if you had been more careful.

If my lawyer had been here last Saturday,he would have prevented me from going.

If he had come yesterday,I should / would have told him about it.

含义:He did not come yesterday,so I did not tell him about it.

If he had not been ill and missed many classes,he would have made greater progress.

含义:He was ill and missed many lessons,so he did not make greater progress.

c.表示对将来的假想

句型:条件从句 主句

一般过去时 should+ 动词原形

were+ 不定式 would + 动词原形

should+ 动词原形

If you succeeded,everything would be all right.

If you should succeed,everything would be all right.

If you were to succeed,everything would be all right.

3、是否 = whether 连接宾语从句

I wonder if she is ill.

不知她是否病了.

㈦ if的用法英语

if的用法如下:

1、表示条件:如果。主句用将来时,if从句用现在时表示将来。

He will come if you invite him.

2、是否:whether连接宾语从句。

I wonder if he is ill.

㈧ if英文的是什么意思

中文:如果再也见不到你,那么祝你早安,午安,晚安。英文:If I never see you again, good morning, good afternoon and good night.

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(8)if英语知识扩展阅读

if 英[ɪf]美[ɪf]

1、conj. (表条件)如果;(表假设)要是,假如;无论何时;虽然,即使;(用于间接疑问)是否;(用于礼貌问询)是否;当,每次;(与情态动词连用)表婉转客气;这不是……,要是……多好;或许不;就算;尽管

2、n. 条件,设想;不确定的情况

IF相关短语:

1、if so如果这样 ; 如果有 ; 如果是这样的话 ; 如果这样的话

2、if statement如果语句 ; 条件语句 ; if语句 ; 假如语句

3、if anything若有任何不同的话 ; 如果有…的话 ; 如果有什么不同的话 ; 如果有什么区别的话

㈨ if的用法总结

以下是我为大家整理的if句型的用法 总结 ,希望能帮助大家更好地认识if句型,提高英语水平。

if的意思和用法:

conj.如果,倘若; 即使; 〈口〉是否; 假设;

n.条件,设想;

1. (表示条件)如果 ,主句用将来时,if从句用现在时表示将来

He will come if you invite him.

如果你请他,他会来的。

2. (表示虚拟)假如,要是

1)时态:可以表示过去,现在和将来的情况。它的基本特点是时态退后。

a. 同现在事实相反的假设。

句型 : 条件从句主句

一般过去时should( would) +动词原形

If they were here, they would help you.

b. 表示于过去事实相反的假设。

句型: 条件从句主句

过去完成时should(would) have+ 过去分词

The rice would not have been burnt if you had been more careful.

If she had worked harder, she would have succeeded.

If my lawyer had been here last Saturday, he would have prevented me from going.

If he had come yesterday, I should / would have told him about it.

含义:He did not come yesterday, so I did not tell him about it.

If he had not been ill and missed many classes, he would have made greater progress.

含义: He was ill and missed many lessons, so he did not make greater progress.

c. 表示对将来的假想

句型: 条件从句主句

一般过去时should+ 动词原形

were+ 不定式would + 动词原形

should+ 动词原形

If you succeeded, everything would be all right.

If you were to succeed, everything would be all right.

If you should succeed, everything would be all right.

3. 是否 = whether 连接宾语从句

I wonder if she is ill.

不知她是否病了。

连接词 conj.

1.(表示条件)如果

He will come if you invite him.

如果你请他,他会来的。

2.(表示虚拟)假如,要是

If I were you, I would never do that.

如果我是你,我决不做那件事。

3.(表示让步)即使

We'll go even if it rains.

即使下雨我们也要去。

4.是否

I wonder if she is ill.

不知她是否病了。

5.(表示因果关系)每一次...的时候(总是会)

If I feel any doubt, I inquire.

我一感到有疑问就随时询问。

if作为连词的时候,一般用于条件状语从句或者是宾语从句或让步状语从句

if引导的条件状语从句:If he comes, please tell me.(如果,假如)

主句和从句位置可以互换,时态:主将从现

变成:Please tell me,if he comes.

宾语从句中:I want to know if(是否) he comes.

可改成:I want to know whether he comes.

当 句子 中有or not是 只能用whether——I want to know whether he comes or not.

if句型的时态:

1.主过从过

2.主句一般现在时,从句任何时

3.客观真理用一般现在时

让步状语从句中,if 解释为即使

名词 cn. 条件;设想

There are too many ifs in his offer.

他的提议中条件太多了

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3. practise 的用法详解

4. quantity的语法和用法

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6. mind的用法

7. refuse/ reject的用法区别

㈩ if有哪些用法

if是英语学习中最为常见的介词之一,那么接下来一起去学习下if的相关用法吧!

用法

1、if作为连词,引导条件状语从句,表示假如,如果等。在复合句中如果主句用将来时,则if引导的状语从句用一般现在时。

例句:If it rains(从句),I will stay at home(主句)=I will stay at home if it rains.如果下雨,我会待在家里。

He will come if you invite him.如果你请他,他会来的。

7、if可引导让步状语从句,这时if有即使是,虽说的含义

例句:If I am wrong,you are wrong too.即使我说错了,那么你也不对。