主将从现-知识讲解-“主将从现”适用于什么样的从句中

主将从现-知识讲解-“主将从现”适用于什么样的从句中
主将从现-知识讲解-“主将从现”适用于什么样的从句中

主将从现知识讲解“主将从现”适用于什么样的从句中

所谓的“主将从现”

第一层次,即“主句用将来时(现在将来时和过去将来时),从句用一般时(一般现在时和一般过去时)”,这一层次也可以称作“初中层次”。

第二层次:“主将”中将来时有将来进行时,将来完成时,将来完成进行时,而“从现”中相应的时态也可能是现在进行时,现在完成时,现在完成进行时。

例如:

If the snow has completely stopped, we will be playing with snow on the playground.

如果雪能够完全停下来,我们将正在操场上玩雪呢!

If it is snowing, we will have been walking in the snow for more than two hours.

@

如果天一直在下雪,我们将在雪地里走了两个多小时了。

另外,引导条件状语从句的连接词(connector)还可以是unless, so long as, in case, on condition that, supposing that, provided that 等。

if引导条件状语从句的两种用法:

第一种用法:

当某事发生的可能性较大时,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 tea cher will scold you.

第二种用法:

1.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。

if引导条件状语从句的两种用法:“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 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。

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?

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

“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。)”

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。)”

当某事发生的可能性较大时,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.

主将从现是指在时间状语从句和条件状语从句中,如果主句是一般将来时,从句用一般现在时替代一般将来时。常见的有以下四种情况:

一、条件状语从句的主句是一般将来时,那么从句常常用一般现在时

如:When I grow up, I’ll be a nurse and look after patients 我长大后要当一名护士,照顾病人

二、如果主句是祈使句,那么从句通常要用一般现在时如:Don’t laugh at me when I make a mistake.

我犯错误的时候不要笑话我。

三、如果主句是含有情态动词的一般现在时,根据需要从句多用一般现在时如:You should be quiet when you are in the reading room 在阅览室时应保持安静四. 如果if的条件状语从句遇到变换间接和直接时, 祈使句应用not to.... 如; She said not to close the window 常见的时间状语从句的连词有:as soon as,when,while ,as,until等主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中,如果主句的时态是一般将来时,那么从句要用一般现在时。例如:I will tell him about it when he comes. If it is fine tomorrow, we will go outing. 如果主句的时态是过去将来时,那么从句要用一般过去时。例如:He said that he would have another try if he had the chance. I knew he could help me if he was free the next day.

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