这篇文章给大家聊聊关于时间状语从句主将从现，以及when在什么情况下用主将从现对应的知识点，希望对各位有所帮助，不要忘了收藏本站哦。
本文目录
一、as引导的时间状语从句是否遵循主将从现
1、“主将从现”,只适合【状语从句】,包括由if,unless等引导的【条件状语从句】和由when,as soon as等引导的【时间状语从句】.如：I will call you as soon as I get there./ If it doesn't rain tomorrow,we'll go on a picnic.,这两个句子都是典型的“主将从现”的句子.
2、As long as能引导条件状语从句吗,是不是主将从现
3、可以引导条件状语从句,如果是指将来的动作,要主将从现
4、As long as you help us,we shall finish the task in time.
5、只要你帮助我们,我们就会按时完成任务
6、as引导时间状语从句，主句和从句应用什么时态？
7、As作连词引导时间状语从句时,着重强调主句和从句中的动作同时发生,并且从句通常放在主句之前。归纳起来有下列两种情况:
8、1)状语从句的谓语动词是持续性动词,从句时态常用进行时态。
9、如:①As he Was waiting,he suddenly heard a voice from above……
10、②As Bethune and the other doctors were climbing the hills,they could see the enemy entering the village in the valley below.
11、2)状语从句的谓语动词是终止性动词,从句时态常用一般时态。
12、如:①As she stood there,she heard the first bell.
13、②As they looked up,they saw another cloud coming towards them.
14、③As they watched.it came nearer and nearer.
二、主将从现的用法和公式
根据英文语法规定，当主句的谓语动词是一般将来时，那么时间或条件状语从句的谓语动词只能用一般现在时来表示将来要发生的动作。例如：
I’ll tell him the news when he comes back.
他回来时，我将告诉他这个消息。
If you take the job, they will talk with you in greater details.
如果你接受这份工作，他们将和你谈谈细节。
它引导的从句使用一般现在时表将来的意思，这时主句和从句在意义上仍保持一致。
如：If he goes to England,he will have to learn English.
If it is fine tomorrow, we will go outing.
这里if所引导的是真实条件句【即所假设的条件有可能成为现实，表达所假设的条件实现时会出现的状况或者会采取的行为】
有时，我们会用并列结构的祈使句来表达这种类型的条件句
If you don’t give him some food,he will starve.
Give him some food,or/elsehe will starve.
祈使句加and和主将从现互换，and后边的将来时相当于条件状语从句中主句的将来时，and前边的祈使句相当于条件状语从句的从句。
Turn on the television，and you will see advertisements showing happy families.
If you turn on the television, you will see advertisements showing happy families.
在if引导的从句中“will+动词原形”并不单纯的表示将来的意义，这里的“will”是一个表示“意愿”的情态动词，相当于“be willing to【愿意】”
当然这种“will+动词原形”的if从句在一些场合是不能随便用的。
if he gets my letter in time,he’ll be able to change his plans
如果他能及时收到我的信，他就能改变他的计划。
却不能说成：if he will get my letter in time,he’ll be able to change his plans.
另外，在if引导的从句中还可以使用“would+动词原形”的结构，这种用法还是表示“意愿”，常表示客气的请求。
这时主句既可以用will/shall+动词原形，以可以用“would（will）/should（shall）/could（can）/might（may）+动词原形”
如：if you would try Italian food,you would like it.
三、英语中,时间状语从句引导的句子都用主将从先吗
如果你还不明白，请接着往下看：
1.由when, while, as引导的时间状语从句。例如：
When you think you know nothing, then you begin to know something.当你以为自己一无所知的时候，你就是在开始知道一些事物了。
When truth is buried under the ground it grows, it chokes, it gathers such an explosive force that on the day it bursts out, it blows up everything with it.当真理被埋在地下的时候，它在生长，它感到压抑，它蓄存着这么一种爆炸性力量，一旦冒出，它就会炸破一切！
Strike while the iron is hot.趁热打铁。
Will you watch my clothes while I have a swim.我游泳的时候，请你照看一下我的衣服。
You can feel the air moving as your hand pushes through it.当你的手在空气中挥动的时候，你就能感觉到空气在流动。
Our headmaster laughed as she spoke.我们的校长边谈边笑。
【区别】when, while和as的区别：when引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。并且when有时表示“就在那时”。例如：
When she came in, I stopped eating.她进来时，我在吃饭。(瞬时动词)
When I lived in the countryside, I used to carry some water for him.当的住在农村时，我常常为他担水。（延续性的动词）
We were about to leave when he came in.我们就要离开，就在那时他进来了。
While引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如：
While my wife was reading the newspaper, I was watching TV.(was reading是延续性的动词，was reading和was watching同时发生)
I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。（对比）
As表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后。例如：
We always sing as we walk.我们总是边走边唱。（as表示“一边……一边”）
As we was going out, it began to snow.当我们出门时，开始下雪了。（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）
2.由before和after引导的时间状语从句。注意before引导的从句不再用否定式的谓语，并且当before引导的从句位于主句之后，有时译成“就，才”。还要注意主句和从句之间的时间关系。当主句用将来时，从句总是用现在时；如果before引导的从句谓语用的是过去时，则主句动词多用过去完成时，这样以便体现动作发生的先后。After表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。例如：
It will be four days before they come back.他们要过四天才能回来。
Einstein almost knocked me down before he saw me.爱因斯坦几乎把我撞倒才看到我。
My father had left for Canada just before the letter arrived.我父亲恰好在信到之前去加拿大了。
They had not been married four months before they were divorced.他们结婚还不到四个月就离婚了。
After you think it over, please let me know what you decide.你仔细考虑过以后，告诉我你是怎样决定的。
After we had finished the work, we went home.完成工作之后，我们回家了。（从句用过去完成时，主句用一般过去时）
3.由till或until引导的时间状语从句。till和until一般情况下两者可以互换，但是在强调句型中多用until。并且要注意的是：如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。till不可以用在句首，而until可以放在句首。例如：
I didn't go to bed until（till） my father came back.直到我父亲回来我才上床睡觉。
It was not until the meeting was over that he began to teach me English.直到散会之后他才开始教我英语。
I worked until he came back.我工作到他回来为止。
I didn't work until he came back.他回来我这才开始工作。
Please wait until I arrived.在我到达之前请等我。
4.由since引导的时间状语从句。 since引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。但在It is＋时间＋since从句的句型中，主句多用一般现在时。例如：
I have been in Beijing since you left.自从你离开以来，我一直在北京了。
Where have you been since I last saw you?自上次我和你见面以后，你到哪里去了？
It is four years since my sister lived in Beijing.我妹妹不在北京住有四年了。
It is five months since our boss was in Beijing.我们老板离开北京有五个月了。
5.由as soon as, immediately, directly, instantly, the moment, the instant, the minute,等引导的时间状语从句。这些连词都表示“一……就”。例如：
I will go there directly I have finished my breakfast.吃完早饭，我立即到那里去。
The moment I heard the news, I hastened to the spot.我一听到消息，马上赶到了出事地点。
As soon as I reach Canada, I will ring you up.我一到加拿大，就给你来 *** 。
【注意】hardly(scarcely, rarely)…when/ before, no sooner…than相当于as soon as之意。主句用过去完成时，从句用一般过去时。当hardly, scarcely, rarely和no sooner位于句首时，主句应用倒装语序。例如：
He had no sooner arrived home than he was asked to start on another journey.他刚到家，就被邀请开始另一旅程。
No sooner had the sun shown itself above the horizon than he got out of bed to commence work.太阳刚从地平线上升起，他就起床劳动去了。
Hardly had I sat down when he stepped in.我刚坐下，他就进来了。
He had hardly fallen asleep when he felt a soft touch on his shoulder.这个 *** 人刚要入睡就感到肩膀上被轻轻一触。
6.由by the time引导的时间状语从句。注意时态的变化：在一般情况下，如果从句的谓语动词用一般过去时，主句的谓语动词用过去完成时；如果从句的谓语动词用一般现在时，主句的谓语动词用将来完成时。例如：
By the time you came back, I had finished this book.到你回来时，我已经写完这本书了。
By the time you come here tomorrow, I will have finished this work.你明天来这儿的时候，我将已经完成此工作了。
7.由each time, every time和whenever引导的时间状语从句。例如：
Each time he came to Harbin, he would call on me.他每次来哈尔滨，总是来看我。
Whenever that man says“To tell the truth”, I suspect that he's about to tell a lie.每当那个人说“说实在话”的时候，我猜想他就要说谎了。
You grow younger every time I see you.每次遇到你，见你更年轻了。
8.由as long as和so long as引导的时间状语从句。这两个连词表示“只要“例如：
You can go where you like as long as you get back before dark.你可以随意到哪里去，只要在天黑以前回来就行。
I will fight against these conditions as long as there is a breath in my body!只要我一息尚存，我就要反对这种境况。
这是一般现在，一般过去，现在进行，过去进行，现在完成，过去完成，现在完成进行，一般将来，过去将来时的时间状语:
1.Often,usually----------动词原型do,does,am,is, are
2.yesterday,last Sunday,in the past-------动词过去式did,was,were
4.while,at that time,-------was doing,were doing
5.since从句,for 2 days,------have done,have been
6.by+过去的某个时间点----had done,had been
7.与现在完成相似-------have been+持续动词ing形式
8.一切表示将来的时间状语，in+一段时间-------将来要发生的一般性动作,
9.与一般将来时相似-----------would+原型
关于时间状语从句主将从现的内容到此结束，希望对大家有所帮助。
