if引导条件状语从句的用法
“主将从现”和表事实时用现在时零碎用法
" if " 引导的条件状语从句的用法,现在总结一下:
if 条件句不一般,几个要点记心间;
条件句,放在前,逗号要放句中间。
条件句表可能，主句多用将来时；
条件句表事实，主句常用现在时。
在 if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如：
We can walk there if we can't find a bus .
If it rains tomorrow , we will not go to the zoo.
What will you do if you find a panda in danger.
如果 if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如：
If bears are in danger ,they attack people.
注意 ：
在 if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若 if 条件句放句首，
从句后面要加逗号，和主句隔开。
还要注意前后时态一致原则
我们知道,引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如:
If you ask him, he will help you.如果你请他帮忙,他会帮你的。
If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。
另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如:
If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。
I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。
那么,除了if之外,是否还有其他连词也可以引导条件状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。
1. unless conj.除非,若不,除非在……的时候
You will fail to arrive there in time unless you start earlier.如果你不早点动身,你就不能及时赶到那儿。
Unless it rains, the game will be played.除非下雨,比赛将照常进行。
2. on condition(that)...在……条件下,如果
on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。
I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相,条件是你答应保守秘密。
You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。
3. supposing conj.如果,假如
supposing引导的条件从句表示一种假设条件。
Supposing it rains, shall we continue the sports meeting?倘若下雨,我们的运动会还要继续举行吗?
Supposing something should go wrong, what would you do then?假如出了什么问题,你准备怎么对付?
4. provided conj.假如,除非,以……为条件
provided (that) +从句表示一种假设条件。
He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件,他就会在合同上签字。
He won't be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见,他就不会在会上反对我们。
从上述例句可以看出if, unless, on condition (that), supposing, provided等词引导的条件状语从句,主从句条件关系分明,结构清晰。但有些句子,虽没有含条件关系的连词,却也隐含着条件关系,这些句子常用一些词,如but for, without等引出一个介词结构来表示条件,条件常常是虚拟的,或与事实相反的假设。如:
but for若非,要不是
But for the rain, we should have a pleasant journey.要不是下雨,我们的旅行肯定会很愉快。
But for your help,we should not have finished in time.要不是你帮忙,我们肯定不能及时完成任务。
重点2 -if句
上个学期，我们曾经学过由if 引导的句子，你还记得吗？对了，“ I’ll not go to the zoo if it rains tomorrow. ( 假如明天下雨，我就不去动物园。) You can come to the party if you don’t wear jeans.（ 如果你不穿牛仔裤，你就能来舞会。）” 这个学期又在本单元见到了似曾相识的同样由if引导的句子，比如：“If I won the lottery, I would give it to medical research. （ 假如我赢了彩票的话，我就捐给医学研究。） If I were you, I would wear jeans and T-shirt.（ 如果我是你，我就穿牛仔裤和T恤。）”
这两个单元学到的句子都是由if引导的。那么，它们有什么区别呢？
分两种情况：
1．something may possible happen
某事发生的可能性较大。
这种情况，有个十三字口诀：“主将从现，主过将从过，主现从现”。即主句是一般将来时，从句用一般现在时；主句用过去将来时，从句用一般过去时；当主句中有can/can’t的话，则从句用一般现在时。例如：
If he has time, he will come tomorrow.
If she finishes early, she can come back early.
If you don’t do homework, the teacher will scold you.
" if " 引导的条件状语从句的用法,现在总结一下:
if 条件句不一般,几个要点记心间;
条件句,放在前,逗号要放句中间。
条件句表可能，主句多用将来时；
条件句表事实，主句常用现在时。
在 if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如：
We can walk there if we can't find a bus .
If it rains tomorrow , we will not go to the zoo.
What will you do if you find a panda in danger.
如果 if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如：
If bears are in danger ,they attack people.
注意 ：
在 if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若 if 条件句放句首，
从句后面要加逗号，和主句隔开。
还要注意前后时态一致原则
我们知道,引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如:
If you ask him, he will help you.如果你请他帮忙,他会帮你的。
If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。
另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如:
If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。
I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。
那么,除了if之外,是否还有其他连词也可以引导条件状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。
1. unless conj.除非,若不,除非在……的时候
You will fail to arrive there in time unless you start earlier.如果你不早点动身,你就不能及时赶到那儿。
Unless it rains, the game will be played.除非下雨,比赛将照常进行。
2. on condition(that)...在……条件下,如果
on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。
I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相,条件是你答应保守秘密。
You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。
3. supposing conj.如果,假如
supposing引导的条件从句表示一种假设条件。
Supposing it rains, shall we continue the sports meeting?倘若下雨,我们的运动会还要继续举行吗?
Supposing something should go wrong, what would you do then?假如出了什么问题,你准备怎么对付?
4. provided conj.假如,除非,以……为条件
provided (that) +从句表示一种假设条件。
He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件,他就会在合同上签字。
He won't be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见,他就不会在会上反对我们。
从上述例句可以看出if, unless, on condition (that), supposing, provided等词引导的条件状语从句,主从句条件关系分明,结构清晰。但有些句子,虽没有含条件关系的连词,却也隐含着条件关系,这些句子常用一些词,如but for, without等引出一个介词结构来表示条件,条件常常是虚拟的,或与事实相反的假设。如:
but for若非,要不是
But for the rain, we should have a pleasant journey.要不是下雨,我们的旅行肯定会很愉快。
But for your help,we should not have finished in time.要不是你帮忙,我们肯定不能及时完成任务。
重点2 -if句
上个学期，我们曾经学过由if 引导的句子，你还记得吗？对了，“ I’ll not go to the zoo if it rains tomorrow. ( 假如明天下雨，我就不去动物园。) You can come to the party if you don’t wear jeans.（ 如果你不穿牛仔裤，你就能来舞会。）” 这个学期又在本单元见到了似曾相识的同样由if引导的句子，比如：“If I won the lottery, I would give it to medical research. （ 假如我赢了彩票的话，我就捐给医学研究。） If I were you, I would wear jeans and T-shirt.（ 如果我是你，我就穿牛仔裤和T恤。）”
这两个单元学到的句子都是由if引导的。那么，它们有什么区别呢？
分两种情况：
1．something may possible happen
某事发生的可能性较大。
这种情况，有个十三字口诀：“主将从现，主过将从过，主现从现”。即主句是一般将来时，从句用一般现在时；主句用过去将来时，从句用一般过去时；当主句中有can/can’t的话，则从句用一般现在时。例如：
If he has time, he will come tomorrow.
If she finishes early, she can come back early.
If you don’t do homework, the teacher will scold you.
if引导的条件状语从句造30个
if引导的条件状语从句造30个
造句如下：
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。
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。
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。
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。
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？
If there was any disappointment it was probably temporary
即便有点儿失望，也肯定是暂时的。
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。
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。
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。
If only you had told me that some time ago
要是你早些时候告诉我该多好啊！
造句如下：
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。
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。
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。
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。
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？
If there was any disappointment it was probably temporary
即便有点儿失望，也肯定是暂时的。
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。
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。
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。
If only you had told me that some time ago
要是你早些时候告诉我该多好啊！
有关if的条件状语从句
您好，
If 条件状语从句(虚拟语气Ⅰ)
if引导的真实条件状语从句，if所在句通常用一般现在时表将来。
可是练习中有一题也出现了非真实条件句，所以有必要提一下虚拟语气。
1）概念
虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。
2）在条件句中的应用
条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。
1.真实条件句
真实条件句用于陈述语气，假设的情况可能发生，其中 if 是如果的意思。
时态关系
句型：条件从句 主句
一般现在时shall/will+ 动词原形
If he comes,he will bring his violin.
典型例题
Thevolleyball match will be put off if it ___.
A.
will rain
B. rains
C. rained
D. is rained
答案B。真实条件句主句为将来时，从句用一般现在时。
注意：
1） 在真实条件句中，主句不能用be going to表示将来，该用shall, will.
(错) If you leave now, you are nevergoing to regret it.
(对) If you leave now, you will neverregret it.
2） 表示真理时，主句谓语动词便不用shall (will) +动词原形，而直接用一般现在时的动词形式。
2.非真实条件句
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 theywere 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 hadworked harder, she would have succeeded.
The ricewould not have been burnt if you had been more careful.
If mylawyer had been here last Saturday, he would have prevented me from going.
If he hadcome yesterday, I should / would have told him about it.
含义：He didnot come yesterday, so I did not tell him about it.
If he hadnot been ill and missed many classes, he would have made greater progress.
含义： He wasill 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 yousucceeded, everything would be all right.
If youshould succeed, everything would be all right.
If you wereto succeed, everything would be all right.
3.混合条件句
主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。
If you hadasked him yesterday, you would know what to do now.
（从句与过去事实相反，主句与现在事实相反。）
If it hadrained last night (过去), it would be very cold today (现在).
4.虚拟条件句的倒装
虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
Were theyhere now, they could help us.
=If theywere here now, they could help us.
Had youcome earlier, you would have met him
=If you hadcome earlier, you would have met him.
Should itrain, the crops would be saved.
=Were it torain, the crops would be saved.
注意：
在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was，即在从句中be用were代替。
If I wereyou, I would gowww.souquanme.com to look for him.
如果我是你，就会去找他。
If he wereh//www.souquanme.comere, everything would be all right.
如果他在这儿，一切都会好的。
典型例题
_____ to dothe work, I should do i搜趣网t some other day.
A. If wereIB. I were
C. Were I
D. Was I
答案C. 在虚拟条件状语中如果有were,should, had这三个词，通常将if省略，主语提前, 变成 were, should, had +主语的形式。但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说 Were I not to do., 而不能说 Weren't I to do.
希望我的回答对您有帮助，www.souquanme.com谢谢！
If 条件状语从句(虚拟语气Ⅰ)
if引导的真实条件状语从句，if所在句通常用一般现在时表将来。
可是练习中有一题也出现了非真实条件句，所以有必要提一下虚拟语气。
1）概念
虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。
2）在条件句中的应用
条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。
1.真实条件句
真实条件句用于陈述语气，假设的情况可能发生，其中 if 是如果的意思。
时态关系
句型：条件从句 主句
一般现在时shall/will+ 动词原形
If he comes,he will bring his violin.
典型例题
Thevolleyball match will be put off if it ___.
A.
will rain
B. rains
C. rained
D. is rained
答案B。真实条件句主句为将来时，从句用一般现在时。
注意：
1） 在真实条件句中，主句不能用be going to表示将来，该用shall, will.
(错) If you leave now, you are nevergoing to regret it.
(对) If you leave now, you will neverregret it.
2） 表示真理时，主句谓语动词便不用shall (will) +动词原形，而直接用一般现在时的动词形式。
2.非真实条件句
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 theywere 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 hadworked harder, she would have succeeded.
The ricewould not have been burnt if you had been more careful.
If mylawyer had been here last Saturday, he would have prevented me from going.
If he hadcome yesterday, I should / would have told him about it.
含义：He didnot come yesterday, so I did not tell him about it.
If he hadnot been ill and missed many classes, he would have made greater progress.
含义： He wasill 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 yousucceeded, everything would be all right.
If youshould succeed, everything would be all right.
If you wereto succeed, everything would be all right.
3.混合条件句
主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。
If you hadasked him yesterday, you would know what to do now.
（从句与过去事实相反，主句与现在事实相反。）
If it hadrained last night (过去), it would be very cold today (现在).
4.虚拟条件句的倒装
虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
Were theyhere now, they could help us.
=If theywere here now, they could help us.
Had youcome earlier, you would have met him
=If you hadcome earlier, you would have met him.
Should itrain, the crops would be saved.
=Were it torain, the crops would be saved.
注意：
在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was，即在从句中be用were代替。
If I wereyou, I would gowww.souquanme.com to look for him.
如果我是你，就会去找他。
If he wereh//www.souquanme.comere, everything would be all right.
如果他在这儿，一切都会好的。
典型例题
_____ to dothe work, I should do i搜趣网t some other day.
A. If wereIB. I were
C. Were I
D. Was I
答案C. 在虚拟条件状语中如果有were,should, had这三个词，通常将if省略，主语提前, 变成 were, should, had +主语的形式。但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说 Were I not to do., 而不能说 Weren't I to do.
希望我的回答对您有帮助，www.souquanme.com谢谢！
用if条件句造句
If I ……I will become rich.多造几个句子 用这个句式If tomorrow rains,I will not go to the park.
If you work harder,you will get higher marks.
If you are more careful,you will do your homework better.
If you work harder,you will get higher marks.
If you are more careful,you will do your homework better.
用If写7个条件状语从句
1If you ask him, he will help you.如果你请他帮忙,他会帮你的。
2If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。
3If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。
4I would have arrived much earlier if I had not beenwww.souquanme.com caught in the traffic.如果没有堵车,我会到的早一点儿。
5If you don’t hurry up,you will be late again. 如果你不快点，你将会迟到。
6. If you copy my homework this time, you will start a bad habit.如果这次你抄我的家庭作业，你将形成一个坏的习惯。.7You can pass the exam if you work hard 如果你努力学习，你能通过考试。
2If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。
3If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。
4I would have arrived much earlier if I had not beenwww.souquanme.com caught in the traffic.如果没有堵车,我会到的早一点儿。
5If you don’t hurry up,you will be late again. 如果你不快点，你将会迟到。
6. If you copy my homework this time, you will start a bad habit.如果这次你抄我的家庭作业，你将形成一个坏的习惯。.7You can pass the exam if you work hard 如果你努力学习，你能通过考试。
