如何区分as和since还有for作为因为来讲时他们的用法.

如何区分as和since还有for作为因为来讲时他们的用法.

副词 adv.
1.同样地, 一样地
She is as tall as her mother.
她和她母亲一样高.
The dining room was twice as big as the Tom's.
这个餐厅比汤姆的餐厅大一倍.
This is as difficult a problem as you are likely to meet.
像这样的难题, 你可能会碰到.
介词 prep.
1.(表示时间)当还是…的时候
As a schoolboy, he showed every sign of genius.
当他还是个小学生的时候, 就显示出了天资聪慧.
2.(表示方式)以…的身份, 以…资格, 作为; 以…形式, 以作为; 以…角色, 扮演…角色; 如同, 像
3.(表示结果)成为, 看作, 看成
We had better treat it as a joke.
我们最好把它当作玩笑.
4.(表示目的)为了, 以…为目的
The dykes were built as a protection against the sea.
建筑堤坝是为了防止海水泛滥.
5.(表示举例)例如, 诸如…之类的
We talked about such subjects as the weather.
我们谈论了诸如天气之类的话题.
连接词 conj.
1.在…期间, 当…时候
I was coming in as he was going out.
我进来的时候, 他正出去.
2.尽管, 即使, 虽然
Intelligent as you are, I suspect you will fail.
尽管你聪明, 我猜想你会失败.
3.像…一样
4.由于, 因为
As you weren't there I left a message.
因为你不在那里, 我留了个信儿.
5.照…方式
6.正如；
介词 prep.
1.(表示时间)从…以来; 自从…之后
I have lived here since January.
自一月份以来, 我一直住在这里.
He had seen her only once since the meeting.
自从那次会议以来, 他只见过她一次.
He's been working in a bank since leaving school.
自从毕业后, 他就一直在一家银行工作.
I have not seen him since then.
从那以后我再也没见过他.
副词 adv.
1.从过去某时间以来[以后, 到现在]
He disappeared many years since.
他多年以前就不知去向.
Her husband died 10 years ago but she has since remarried.
她丈夫于十年前去世, 但她后来又嫁人了.
I've long since forgotten what our quarrel was about.
我早就忘掉我们为什么吵架了.
It was not long since that I returned.
我是在不久前回来的.
He came to London 3 years ago and has lived here ever since.
他三年前来到伦敦, 此后就一直住在这里.
连接词 conj.
1.自从(过去某事)以来[以后, 到现在]
Since I left college, I have not seen him.
自从我离开大学以后, 就没有见过他了.
They have never been to see me since I was ill.
自从我生病之后, 他们一直没来看过我.
Since I have owned a bicycle, I have gone to school by it every day.
自从我有了一辆自行车后, 我每天骑车上学.
I have known him ever since I was a child.
我自孩提时代起就已经认识他了.
It is ten years since she left me.
自从她离开我已经十年了.
It is five years since he left here.
他离开这儿已有五年了.
It is three years since I have seen him.
我已经三年没见到他了.
It was four months since we had been here.
我们已经有四个月没来这了.
His health is much improved since he gave up smoking.
他自戒烟以来, 健康状况大大改善了.
I met him last week.Since we left school, we had often written to each other.
上周我遇见了他.自从我们离开学校后, 我们曾经常互相写信.
The man has been drinking beer ever since the party started.
晚会开始以来, 那个男人就一个劲儿地喝啤酒.
She has been collecting stamps since she was a child.
她从小起就一直在集邮.
2.因为; 既然; 由于
Since it is late I shall go home now.
由于时间晚了, 我现在要回家了.
Since you are so sure of it he'll believe you.
既然你对此这么有把握, 他会相信你的.
介词 prep.
1.(表示时间)在(某一特定时间); 在…时节; 持续达
2.(表示方向)向, 朝, 开往
They made a rush for the exit.
他们猛然冲向出口处.
3.(表示对象) 替, 帮, 给, 为…做准备, 对, 对于, 对…来说, 在…一方
What can I do for you?
我能帮你什么忙吗?
Let me lift that heavy box for you.
让我替你提那只重箱子.
You had to be ready for any emergency.
你得随时预防不测.
This inspired in them a love for learning.
这使他们产生了学习的热情.
Fortunately for him, he can swim.
对他来说幸运的是, 他会游泳.
He speaks too softly for her to hear.
他讲话声音太轻, 她听不见.
4.(表示原因)因为, 由于, 作为…的结果
I'm pretty angry with you for not telling me.
由于你没有告诉我, 我对你很生气.
5.(表示距离)延续达, 计有
I followed him for some distance.
我跟着他走了一段路程.
6.(表示结果)当做, 作为, 作为…的部分, 就…的条件而言
We can't accept that as a basis for a decision.
我们不能同意以此为基础来做出决定.
7.(表示目的)为了…, 适用于
The ship sent out a message for help.
船只发出求救信号.
She's the very person for the work.
她最适合干这项工作.
8.(表示态度)支持, 赞同, 想要
Are you for the plan or against it?
你支持这计划还是反对它呢?
9.(表示比率)按…比例, 以…价格, 第…次
I bought this book for ￡3.
我买这本书花了三英镑.
I met them for the second time last week.
我上周第二次遇见他们.
10.（表示对象、用途等）给,对,供
11.关于
12.代表
13.受雇于
14.支持；拥护
15.为得到；为获取
16.换取
17. 就…而言
18. 对（某人）来说（困难、必需、愉快等）
连接词 conj.
1.因为, 由于
Prepare to alight, for we are almost there.
我们马上要到了, 准备下车吧.