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if引导的从句用什么时态
如果应付中考的话，if引导的虚拟语气就没有必要了解了，中考绝对不会考的。我是过来人，2008年才参加完中考，全国各地的试题都不会出那样的题，出现了就是超纲，命题人要受批评的。
我理解，if引导的从句主要掌握两方面，一是引导宾语从句，二是引导条件状语从句。这两个是热点，很有可能考的。下面就来给你叙述一下。
先看一个句子 i ask my mother if my cousin will come here tomorrow.
if在这里是表示“是否”的意思，可以和whether互换。
这个句子不重要，我想给你深入点。把这个句子拆分：
i ask my mother"will my cousin come here tomorrow?"
你看看，拆开来的句子是不是和原句意思一样？实际上，拆开来的句子是属于直接引语，把它改写成间接引语时就是把它变成宾语从句的形式。而if在这里是引导词的作用。记住记住，当直接引语中引号里面的句子是一般疑问句时，改写成间接引语（宾语从句）时通通用if来引导！！！切记
但是，有3种情况不能用if只能用whether.
1 介词后面不能用if 2 在宾语从句中，从句部分有or not时（这是考试最爱考的） 3 主句动词是discuss，其后跟的宾语从句也只能用whether引导
eg i want to know whether he will come or not
they are discussing whether they will go for a picnic or not
至于if用来引导条件状语从句就很简单了，死死记住一个原则，主句是一般将来时（或是祈使句），从句就是一般现在时。
eg if it dosen't rain,we will go for a picnic tomorrow
if he comes tonight,give him the money.
告诉你一个常识，不知道你是否清楚。复合句中如何分主从句。
当主句在前从句在后是，不会有逗号，引导词前是主句，后是从句
当从句在前是，会有逗号隔开，逗号前是从句，后是主句。
所有以上都是原创，应付中考完全没问题，对着这些知识点，再做几个题，这一部分就复习过了！希望能够帮到你，也希望你能把我答案作为最佳，给不给分倒没所谓，只是想帮到你。去年这个时候我也在备战中考呢！如果你还有不懂，尽管发信息再问我，祝你考上理想高中！！！
补充：在湖北的话又不同。湖北是全国教育最厉害的，学的东西特别难，学生特别厉害。既然如此，我就再讲讲虚拟语气吧！！
顾名思义，虚拟语气就是表示非真实的情况，可以表示与过去现在将来的事实相反，也可以表示不可能发生的情况。我以几个例题和句子来讲解。
eg if i were you,i wouldn't make such a decision.
if i am you,i won't make such decision.
如果我是你，我不会做出这样的决定。显然下面这个句子是一个真实条件句，遵循了一般的规律。但是“我是你”这是不可能的情况，所以用虚拟语气来表达，这主要体现在动词的时态上，把动词通通变为过去时。不过这与现在事实相反的场合。对于与过去和将来的事实相反，通通把主从句动词时态往后退一步就行了。
eg i would be able to see him if i had gone to the party.
if it should rain tomorrow,we couldn't go for a picnic.
就是这样的。也没有什么好讲的。就算武汉的中考要考虚拟语气，在单项选择里面出一个题就了不起了。而且对这个语法点的要求不会高的，懂皮毛就行了。我看了一下去年你们武汉的题，没有涉及到虚拟的题，是因为没有必要，而且虚拟现在在高中阶段也不算是重点内容了。反倒是你们的中考对于词汇辨析要求很高，建议你多对词汇进行辨析，多背固定搭配，这才是能拿高分的地方。
好了，又说那么多了，你还有什么不懂的再问吧。
条件状语从句例句
条件状语从句例句：
1、If you cheat in the exam you’ll never get away with it.
考试作弊必予追究。
2、Unless you go at once you will be late.
如果你不马上走，就会迟到的。
3、I’ll remember that day as long as I live.
只要我活着，我就不会忘记那个日子。
4、In case I forget, please remind me about it.
万一我忘记，请提醒我一下。
5、I don’t know if it will rain tomorrow. But if it rains tomorrow, I’ll stay at home.
不知道明天是否会下雨，但要是下雨的话，我就呆在家里。
时间状语从句的例题及答案解析
Adverbial Clauses
状语从句 1.分类
英语状语从句可表示时间、地点、条件、方式、让步、原因、比较、目的、结果等意义。不同的状语从句要求不同的连词或相当于连词的词组引出。以下是常用的引导状语从句的连词：
时间状语：when, while, as, before, after, since, until, the moment, as soon as
地点状语：where, wherever
条件状语：if, unless, as/so long as, suppose
方式状语：as, as if, as though
让步状语：though, although, even if, even though
原因状语：as, because, since, now that
比较状语：as...as, than, the...the, not so...as
目的状语：so that, in order that, for fear that, in case
结果状语：so that, so...that, such...that, that 2.时间状语从句
The street were less crowded when Mr.Budd let him out.
巴德先生让他出来的时候，街上行人已少了一些。
I'll come back as soon as is over.
一下课我就回来。
Please don't go anywhere before I come back.
我回来之前，哪儿也别去。
The telephone rang while I was having a bath.
我洗澡时，电话铃响了。 1)表示将来时间时，时间状语从句须用一般时态代替将来时态。
We will go fishing if it is fine tomorrow.
如果明天晴，我们就去钓鱼。
Soon after you jump, the parachute will open.
你一跳，降落伞就会打开。 2)when, while, as在引导时间状语从句时的区别：when表示从句的动作与主句的动作一个紧接着一个发生，也可表示从句动作在主句动作之前或之后发生。从时间上来说，它既可指一段时间，也可指某一具体时刻。
She opened the door when she heard the door bell.
她听到门铃响就把门打开了。
When he called, I was making lunch in the kitchen.
他来电话时，我正在厨房做午餐。
I used to eat in small restaurants when I was in London.
我在伦敦时，常在小饭馆吃饭。
I'll tell him about in when I see him.
我看到他时我会告诉他的。 while表示从句的动作与主句的动作同时发生，从句动作往往是有延续性的，因此从句所用的谓语动词往往是延续性的动词。从时间上来说，while指一段时间。
The light went out while I was reading the newspaper.
我正在读报时，灯灭了。
He repaired the leaking tab while the rest of the family were watching TV.
家里其他人在看电视的时候，他把漏水的龙头给修好了。
as表示某事发生的过程中另一件事发生了，亦可用来表示两个同时发生的动作。
As I drove past the crossroads, a red car suddenly shot right past me.
我开车过十字路口时，一辆红色的轿车突然从我旁边飞驰而过。
A look of surprise came into his eyes as he read the message.
他读着条子，眼里流露出吃惊的神情。
As he did so he nearly ran into a large man who suddenly came in through the doorway.
就在他这么做的时候，他几乎与一个突然进来大个子撞了个满怀。 3.地点状语从句
where, wherever引导地点状语，意思与in/at/to/the place where接近。
I'll drive you wherever you are going.
你去任何地方我都开车送你去。
You have the right to live where you want.
你有权住在你想住的地方。
It's your fault that she is where she is.
她落到今天这个地步是你的错。
Where there is a will, there is a way.
有志者事竟成。 4.原因状语从句
引导原因状语从句的连词主要有because, as, since。because表示的语气最强，通常用于回答以疑问词why引导的疑问句。as和since表示的原因通常对方是知道的，since较as正式。because可以代替as, since,但as和since不一定能代替because。
He failed the exam because he didn't study hard.
他考试不及格是因为他学习不努力。
He distrusted me because I was new.
因为我是新来的所以他不信任我。
As it is raining, you'd better take a taxi.
正在下雨，你最好乘出租车。
As all seats were full, he stood up and gave up his to an old lady.
由于所有的座位都有人了，他就站起来把他的座位让给了一位老太太。
Since you are going, I'll go, too.
既然你要去，那我也去。
Since you have no objection, let's get started.
既然你不反对，那就让我们干吧。 5.目的状语从句
She ate her supper quickly so she could go out early.
她很快吃晚饭以便能早点出来。
They drove with both windows closed so that he would not catch cold.
他们开车时把两边的窗子都关上了，这样他就不会感冒。
Speak clearly so that they will understand you.
说话清楚点好让他们明白你的意思。
These men risk their lives in order that we may live more safely.
这些人冒着生命危险是为了让我们更加安全地生活。
Don't let your baby play with your watch in case he damages it.
别让你的孩子玩你的表以免把表弄坏。
I'll buy some beer in case Uncle Tom drops in at the weekend.
我要去买些啤酒以备周末汤姆叔叔来。
目的状语从句中常用can/could, may/might, will/would, shall/should等情态动词。
He wore a pair of sunglasses for fear that he would/might be recognized.
为了不让人认出来，他戴了一副墨镜。 6.让步状语从句
Though we have worked with John for years, we don't know much about his family.
尽管我们和约翰一起工作多年，我们对他的家庭还是了解甚少。
Even though you don't like him, you should be polite.
尽管你不喜欢他，你还是应该礼貌一些。
Although we were poor, we were very happy.
尽管我们穷，但我们很快乐。
He is a good man even though I don't always agree with him.
尽管我们的看法有时不同，但他人是好的。
Even if he proves to be wrong, he wouldn't admit it.
即使已经证明他错了，他也不会承认。
as也可引导让步状语从句，但只用在形容词／副词＋as＋主语＋谓语的结构中。这一结构主要用于正式文体，不用于非正式文体。
Patient as he was, he had intention of waiting for three hours.
尽管他很有耐心，但他还是不打算等三个小时。
Young as he is, she has five years of teaching behind her.
尽管她还年轻，但她已经有五年的教学经历了。
Hard as he tried, he couldn't cope with his responsibilities as manager.
尽管他很努力，但他实在不能胜任经理的职责。 7.方式状语从句
Do as you are told.
叫你怎么做你就怎么做。
I've changed the title of the essay as you suggested.
我已经照你所建议的那样把文章的题目改了。
She had never spoken so excitedly as she did then.
她说话从来也没有像那会儿那样激动过。
The other day he spoke about John as if he knew him.
前两天他谈起约翰，就好象他认识他似的。
I remember the whole thing as if it had happened yesterday.
整件事我都记得，仿佛它就发生在昨天。
He told us what had happened yesterday as if he had witnessed the whole thing.
他把昨天发生的事情都告诉了我们，就像是他亲眼目睹了一切似的。 8.结果状语从句
One of her lungs is affected a little so she has to rest.
他的一叶肺有点感染，所以她得休息。
I missed the bus so I didn't get home until very late in the evening.
我没赶上汽车，所以晚上很晚才到家。
His father works so late every day that he hardly ever sees him.
他父亲每天都工作到很晚，他几乎见不到他。
His heart beat so fast that he could hardly breathe.
他的心脏跳得那么快，他几乎不能呼吸了。
It gave him such a shock that his face turned white.
这使他大吃一惊，以至他的脸都白了。
What's the matter with you that you look so worried?
你看上去忧心忡忡的，出什么事了？
wonder if引导的从句
if引导从句如下：
1、He will come if you invite him.
如果你请他，他会来的。
2、I wonder if she is ill.
不知她是否病了。
3、If I were you, I would never do that.
如果我是你，我决不做那件事。
4、I will tell him about it as soon as he comes back.
他一回来我就告诉他这件事。
5、I don't know if he will come tomorrow.
我不知道他明天是否回来。
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