嗫?暁雲?
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
The volleyball 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 never going to regret it.
(对) If you leave now, you will never regret 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。
16.2 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 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.
16.3 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 had asked 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 had rained last night (过去), it would be very cold today (现在).
16.4 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 they here now, they could help us.
=If they were here now, they could help us.
Had you come earlier, you would have met him
=If you had come earlier, you would have met him.
Should it rain, the crops would be saved.
=Were it to rain, 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 were you, I would go to look for him.
如果我是你，就会去找他。
If he were here, everything would be all right.
如果他在这儿，一切都会好的。
典型例题
_____ to do the work, I should do it some other day.
A. If were I B. 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.
16.5 特殊的虚拟语气词：should
1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型：
(1)suggested
It is (2)important that…+ (should) do
(3) a pity
(1)suggested, ordered, proposed, required, demanded, requested, insisted； + (should) do
(2)important, necessary, natural, strange
a pity, a shame, no wonder
(3)It is suggested that we (should) hold a meeting next week.
It is necessary that he (should) come to our meeting tomorrow.
2）在宾语从句中的应用
在表示命令、建议、要求等一类动词后面的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + (should) do
I suggest that we (should) hold a meeting next week.
He insisted that he (should ) be sent there.
注意： 如suggest, insist不表示"建议" 或"坚持要某人做某事时"，即它们用于其本意"暗示、表明"、"坚持认为"时，宾语从句用陈述语气。
The guard at gate insisted that everybody obey the rules.
判断改错:
（错） You pale face suggests that you (should) be ill.
(对) Your pale face suggests that you are ill.
(错) I insisted that you ( should) be wrong.
(对) I insisted that you were wrong.
3）在表语从句，同位语从句中的应用
在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气，即（should）+动词原形。
My idea is that we (should) get more people to attend the conference.
I make a proposal that we (should) hold a meeting next week.
有if引导的句子一定要虚拟么？
1、可以虚拟也可以不虚拟，2、关于if的条件句：条件句可分为真实条件句和非真实条件句。
真实条件句表示句子所描述的事件是事实或在说话人看来可能实现的事情。
非真实条件句表示的条件与事实相反或不大可能实现的事情，即我们所说的虚拟语气。
引导真实条件状语从句的连词和词组有if, unless,once,as / so long as, so / as far as, in case, provided (that), providing (that), suppose (that), supposing (that),given (that),assuming (that),on condition (that)等。
3、虚拟语气的使用范围及判断一、虚拟语气表示一种不能实现的假设。
该语法主要用于if条件状语从句。
也可用于主语从句、表语从句、宾语从句等。
二、if条件状语从句中虚拟语气的判断判断是真实条件句还是非真实条件句。
只有在非真实条件句中才使用虚拟语气。
通过句子意思，看假设的条件是否能够实现，能够实现是真实条件句，不能使用虚拟语气；假设的条件不能实现则是非真实条件句，要用虚拟语气。
判断这个假设是与哪个事实相反。
通常有三种情况：①与过去事实相反。
②与现在事实相反。
③与将来事实可能相反。
三、“后退一步法”后退一步法是指在准确地判断了该句与哪一事实相反后，按虚拟语气的后退一步法处理从句谓语动词的时态。
即：在非真实条件状语从句中，谓语动词按正常情况“后退一步”。
也就是：①与过去事实相反，在从句中用过去完成时形式表示。
②与现在事实相反，在从句中用过去一般时形式表示。
③与将来事实可能相反，在从句中用过去将来时形式表示。
主句中则用情态动词would, should, could 等加一个与从句一致的动词形式。
例：If I had come her yesterday, I would have seen him.If I were a teacher, I would be strict with my students.If it should snow tomorrow, they couldn't go out.四、注意事项①if条件句中如有were, should, had，可以省去if，并使用倒装语序。
②在现代英语中if条件状与从句中的谓语动词如果是be其过去形式一般用were。
造10个由If引导的句子
其实你的问题很简单，英语里的语法规则没有永恒的定律.一般情况下，if 引导的条件状语从句是主将从现，没说绝对哦！补充一点：“主将”指主句用一般将来时，过去将来时等都可； “从现”指从句用一般现在时，现在完成时等都可.英语作为一门语言，和汉语一样，怎么会有绝对一说，等你学多了，很多本身错误的语法都会被承认的！
请问if 引导的条件状语从句有几种形式
状语从句： 用一个句子（从句）来作另一个句子（主句）的状语，用作状语的句子就叫作状语从句。
作什么样的状语就叫什么类型的状语从句。
例如：条件状语从句就是用一个句子来作条件状语。
状语从句的分类： （1）时间状语从句 凡是从句都必须有引导词，引导时间状语从句的词有when,before,after,until,as soon as,while 等。
（2）条件状语从句 主要看一下由if引导的条件状语从句。
if 意为“如果”，引导条件状语从句时，表示假如有从句的动作发生就（不）会有主句的动作发生。
例如： If it doesn't rain tomorrow,we will go there by bike.如果明天不下雨，我们就骑自行车去那里。
If I get there early,I can see the doctor quickly.如果我早早地到那里，我就可以快点看病。
3）地点状语从句用法要点 常用where（哪里）和wherever（无论哪里）eg. Where there is a will,there is a way. 有志者，事竟成。
We will go wherever the motherland need us most. 我们要到祖国最需要的地方去。
（4）原因状语从句用法要点 常用的引导连词有because,as和since，三者的区别是：在回答问题的时候，使用because；对于显而易见的原因，常用as或since;as和since的从句常放在主句之前，而because的从句常放在主句之后。
eg. Why did you go? I went because Tom told me to go. 你为何去？那是因为汤姆叫我去。
He was angry not because we were late but because we made a noise. 他很生气不是因为我们来迟了，而是因为我们弄出了声音。
As it was raining hard,we had to be indoors. 由于雨太大，我们只好呆在家里。
Since you feel ill,you'd better not go to work. 既然你感觉不舒服，你最好不要去上班了。
（5）目的状语从句用法要点 常用的引导连词有so that,that和in order that译为：以便，为了，目的是。
eg. Please speak more slowly so that we can make full notes. 请讲慢一点，以便我们能作详细笔记。
I shall write down your address that I may not forget. 我要把你的地址记下来，以免忘记。
I sent the letter by air mail in order that it might reach him in time. 这封信我以航空信发出，以便他能及时收到。
注：目的状语从句可以用动词不定式来替换做目的状语。
eg. We work harder than usual finish it in a week. 我们比平常加倍努力工作以在一周内完成工作。
三、主句与从句时态一致的问题。
在时间状语从句和条件状语从句中，主句和从句之间的时态一致问题一般分下列两种情况： 1. 若主句是祈使句，或主句中有情态动词，或主句中谓语动词是一般将来时，那么从句用一般现在时表示一般将来时。
例如： Be careful when you cross the road. 过马路时要小心。
Put up your hand if you have any questions to ask. 如果你们有问题要问的话，请举手。
The traffic must stop when the lights are red. 红灯亮时，车辆必须停下。
2. 若主从句谓语动词都是陈述过去，那么主从句都可以用一般过去时。
例如： She could sing when she was four years old. 她四岁的时候就会唱歌。
If 引导的条件状语从句如何应用
展开全部 状语从句： 用一个句子（从句）来作另一个句子（主句）的状语，用作状语的句子就叫作状语从句。
作什么样的状语就叫什么类型的状语从句。
例如：条件状语从句就是用一个句子来作条件状语。
状语从句的分类： （1）时间状语从句 凡是从句都必须有引导词，引导时间状语从句的词有when,before,after,until,as soon as,while 等。
（2）条件状语从句 主要看一下由if引导的条件状语从句。
if 意为“如果”，引导条件状语从句时，表示假如有从句的动作发生就（不）会有主句的动作发生。
例如： If it doesn't rain tomorrow,we will go there by bike.如果明天不下雨，我们就骑自行车去那里。
If I get there early,I can see the doctor quickly.如果我早早地到那里，我就可以快点看病。
3）地点状语从句用法要点 常用where（哪里）和wherever（无论哪里）eg. Where there is a will,there is a way. 有志者，事竟成。
We will go wherever the motherland need us most. 我们要到祖国最需要的地方去。
（4）原因状语从句用法要点 常用的引导连词有because,as和since，三者的区别是：在回答问题的时候，使用because；对于显而易见的原因，常用as或since;as和since的从句常放在主句之前，而because的从句常放在主句之后。
eg. Why did you go? I went because Tom told me to go. 你为何去？那是因为汤姆叫我去。
He was angry not because we were late but because we made a noise. 他很生气不是因为我们来迟了，而是因为我们弄出了声音。
As it was raining hard,we had to be indoors. 由于雨太大，我们只好呆在家里。
Since you feel ill,you'd better not go to work. 既然你感觉不舒服，你最好不要去上班了。
（5）目的状语从句用法要点 常用的引导连词有so that,that和in order that译为：以便，为了，目的是。
eg. Please speak more slowly so that we can make full notes. 请讲慢一点，以便我们能作详细笔记。
I shall write down your address that I may not forget. 我要把你的地址记下来，以免忘记。
I sent the letter by air mail in order that it might reach him in time. 这封信我以航空信发出，以便他能及时收到。
注：目的状语从句可以用动词不定式来替换做目的状语。
eg. We work harder than usual finish it in a week. 我们比平常加倍努力工作以在一周内完成工作。
三、主句与从句时态一致的问题。
在时间状语从句和条件状语从句中，主句和从句之间的时态一致问题一般分下列两种情况： 1. 若主句是祈使句，或主句中有情态动词，或主句中谓语动词是一般将来时，那么从句用一般现在时表示一般将来时。
例如： Be careful when you cross the road. 过马路时要小心。
Put up your hand if you have any questions to ask. 如果你们有问题要问的话，请举手。
The traffic must stop when the lights are red. 红灯亮时，车辆必须停下。
2. 若主从句谓语动词都是陈述过去，那么主从句都可以用一般过去时。
例如： She could sing when she was four years old. 她四岁的时候就会唱歌。
用If引导的条件状语从句造五个句子,不要太复杂（快,急用）
1:If you want to go,please tell me.2:If it doesn't rain tomorrow,I will go shopping .3:If you succeeded, everything would be all right.4:If you eat a lot of sugar,you will put on weight.5:If you don't get up early,you will be late for school.
if引导的虚拟条件句三种句型 1 与现在 2 与将来 3 与过去
一、对现在情况的虚拟条件从句中谓语动词用一般过去式，主句用“would/should/might/could+动词原形”形式，表示对现在不可能实现情况的假想。
If I were you,I would choose to work in a small town.如果我是你，我会选择在小城镇工作。
（事实上我不是你）If I had a map now,we could easily get out of the forest.如果现在有地图，我们能很容易地走出森林。
（事实上是现在没有地图）注意：在条件从句中，如果谓语动词是be的形式，不管主语是单数还是复数，书面语中用were，而口语中如果是单数，也可以用was，不过在if I were...中一般用were.If the world were perfect,how could we enjoy the pleasure and comfort of being successful?世界若完美，我们如何能尝到创造成功的快慰？二、对过去情况的虚拟条件从句中谓语动词用过去完成式，主语用“would/could/should/might+have+动词的过去分词”形式。
If it had not been for your help yesterday,I could not have caught the bus.如果昨天没有你的帮助，我不会赶上公交车。
（事实是你昨天已经帮助了我，所以我赶上了车）三、对将来情况的虚拟在表示与将来事实相反的条件从句中，谓语动词可用should do,were to do或动词的过去式三种形式表示，但意义略有不同。
should表示的可能性最大，动词过去式的可能性次之，were to do 的可能性最小。
If things were to be twice,all would be wise.假如凡事都可以重新做一次，人人皆可成为聪明人。
（事实是并不是所有的事都可以重新做一次）。
扩展资料虚拟条件句往往指不能实现或纯假想的情况，可以对过去、现在或将来进行假想。
虚拟语气的本质就是对根本不可能的情况发生假设。
我们可以记住这样一个原则，即把时态向过去推一格。
其他虚拟条件句一、错综时间条件句有些条件句的主句谓语和从句谓语表示的动作在时间上并不一致，这类句子称为错综时间条件句。
If you had taken my advice then,you would not be in trouble now.如果当时听我的劝，你现在就不会有麻烦了。
（if 条件句是对过去的虚拟，故用过去完成时，而主句是对现在的虚拟，故用“would+动词原形”形式）二、含蓄条件句有些句子虽不含条件从句，但意思和条件句相差不多，这种句子称为“含蓄条件句”，这种句子有时候会用虚拟语气。
Without electricity,the world would be dark.(=If there were no electricity ,the world would be dark.)如果没有电，世界将会一片黑暗。
参考资料：百度百科虚拟条件句
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