以下是小编为大家准备的条件状语从句的用法的结构,本文共7篇,仅供参考,大家一起来看看吧。

篇1:条件状语从句的用法的结构
unless = if...not.
e.g. Let's go out for a walk unless you are too tired.
If you are not too tired,let's go out for a walk.
if 引导的条件句有真实条件句和非真实条件句两种:
真实条件句
如:If it rains tomorrow,we won’t go on a park 非真实条件句是虚拟语气的一种,表示与事实相反,如:
If I were you,I would go with him.
so/as long as只要
由as (so) long as,in case引导。
So long as you’re happy,it doesn’t matter what you do.
只要你高兴,你做什么都没有关系。
You may borrow my book as long as you keep it clean.
只要你保持书的清洁,你就可以把我的书借去。
Take your umbrella in case it rains.
带着你的伞吧,以防下雨。
例句
引导条件状语从句的连词有:if(如果),unless(除非;如果不),as long as(除非;只要),supposing(假设),on condition that(条件是),in case(如果)。
【例】
You can't learn English well unless you work hard.
除非你努力学习,否则你学不好英语。
You can use my bike on condition that you return it by Friday.
你可以使用我的自行车,条件是你星期五以前还。
篇2:条件状语从句的用法的结构
条件状语从句可相应译成表示条件或表示假设的分句,例如翻译成:如果、要是等引导的分句。
Sometimes this fall, if all goes well, a revolutionary new undersea vessel will be lowered gently
into the waters of Monterey Bay for its maiden voyage.
分析:if引导的条件状语从句插在主句的中间,翻译时也做了同样的处理。
参考译文:今年秋天,如果一切顺利的话,一只革命性新潜艇将轻轻在蒙特利海湾下水,进行它的第一次航行。
The amount of deformation is directly proportional to the applied stress provided the force does
not exceed a certain limit.
分析:本句中的条件状语由provided引导。引导条件状语从句的词组还有providing, as long as等。
参考译文:如果外力不超过某一限度的话,那么形变量与外力成正比。
篇3:条件状语从句的用法的结构
连接词主要有 if, unless, as/so long as, on condition that 等.if 引导的条件句有真实条件句和非真实条件句两种.非真实条件句已在虚拟语气中阐述.
unless = if not. 例如:
Let's go out for a walk unless you are too tired. 如果不太累,我们去散散步.
If you are not too tied, let's go out for a walk.
典型例题
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A.句意:除非你立即走,否则你就回迟到的.可转化为 If you dong leave immediately, you will be late.B、D句意不对,or表转折,句子如为 You leave immediately or you will be late.
篇4:条件状语从句的用法的结构
⑴条件状语从句中一般不使用将来时态,尽管主句使用将
来时态,而从句用一般现在时或现在完成时。
【例】
I will come to see you if I have time.
我有时间,我就来看你。
If the rain stops,I shall go out for a walk.
如果雨停了,我就出去散步。
⑵注意条件状语从句在虚拟语气中的使用。
【例】
If I were to I should first of all get the experts to discuss the plan.
如果我真的想做这事,我首先会找专家们讨论我的计划。
⑶条件状语从句中的省略。
【例】
Come tomorrow if possible. 可能的话,明天来。
I will buy a DVD set if necessary.
篇5:if引导的条件状语从句用法有哪些
什么是if引导的条件状语从句
引导条件状语从句最常用的连词是if,常见的'if条件状语从句表示在某条件下,某事很
可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的。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。
If you have finished the homework,you can go home.如果你作业做完了就可以回家了。
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,表示对现在或过去的一种假设。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.要不是交通堵塞,我本会来得早一些。
另外还要注意if条件句的时态搭配:
1、if从句用一般现在时,主句用一般将来时
If he runs he’ll get there in time.如果他用跑的,他就会及时赶到那儿。
The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你。
2、if从句用一般现在时,主句用may/might/can
If the fog gets thicker the plane may/might be diverted.如果雾在大一些,飞机可能就会改在别的机场降落。
If it stops snowing we can go out.如果雪停了,我们就可以出去。
3、if从句用一般现在时,主句用must/should
If you want to lose weight you must/should eat less bread.如果你想减肥,你必须少吃面包。
4、if从句用一般现在时,主句用一般现在时
If you heat ice it turns to water. (也可用will turn)如果把冰加热,它就会化成水。
5、if从句用现在进行时,主句用一般将来时
If you are looking for Peter you’ll find him upstairs.如果你是在找彼得,上楼就会找到他。
6、if从句用现在完成时,主句用一般将来时
If you have finished dinner I’ll ask the waiter for the bill.如果你吃完了,我就叫服务生来算账。
篇6:条件状语从句
连接词主要有 if, unless, as/so long as, on condition that 等。.
if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
unless = if not.
let's go out for a walk unless you are too tired.
if you are not too tied, let's go out for a walk.
典型例题
you will be late ___ you leave immediately.
a. unless b. until c. if d. or
答案a。 句意:除非你立即走,否则你就回迟到的。可转化为 if you dong leave immediately, you will be late. b、d句意不对,or表转折,句子如为 you leave immediately or you will be late.
篇7:条件状语从句
条件状语从句
连接词主要有 if, unless, as/so long as, on condition that 等。.if 引导的`条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied, let's go out for a walk.
典型例题
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A。 句意:除非你立即走,否则你就回迟到的。可转化为 If you dong leave immediately, you will be late. B、D句意不对,or表转折,句子如为 You leave immediately or you will be late.
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