as与since的区别

as与since的区别
as与since的区别

as与since的区别
（1）时间（Time）
表达时间的从属连词有：when, while, as ,before, after, till ,until, since, the moment/ instant, as long as ,whenever, etc．
例A：Babies cry when they are hungry．
（婴儿饿的时候就会哭.）
例B：When I get there I'll give you a call．
（我到达那边时会打个电话给你.）
例C：A Mr．Johnson came to see you while you were out．
（你不在时有位叫约翰逊的先生来看你.）
例D：While I was standing outside the post office ,I saw Mary walking into the bookstore opposite （the post office）．
（我站在邮局外面时,看到玛丽走进了邮局对面的书店.）
例E：As I sat down beside her, she stood up and walked away．
（我在她的旁边坐下来,她就站起来走开了.）
例F：Very often she sings as she does the housework．
（她常常一面做家务一面哼着歌.）
例G：The old man（had） died before the doctor came．
（那位老人在医生来之前死了.）
例H：She got married right after she graduated from college．
（她大学毕业之后就结婚了.）
例I：We walked and walked till/until it was quite dark．
（我们一直走,一直走,走到天完全黑了.）
例J：Until you told me, I had no idea of it at all．
（直到你告诉我为止,对那件事我全然不知.）
例K：I haven't heard from her since she left for Australia．
（自从她到澳大利亚去之后我就一直没有她的消息.）
例L：The policemen rushed to the bank the moment they got the alarm．
（警察一接到警报就立刻赶到银行去了.）
例M：I'll let you know as soon as I've received the result．
（我一有结果就立即通知你.）
例N：You may stay here as/so long as you keep quiet．
（只要你不吵,你就可以留在这里.）
例O：I go to my teacher for advice whenever I am in trouble．
（每当我有麻烦时我就去请教我的老师.）
解说 要在一个句子里表达两个动作,说“……A……的时候就……B……”,“when”是最常用的表时间的从属连词（例A）.表示相接发生的两动作也常使用“when”（例B）.
“while”是表示“during the time that…”的意思,也就是说含有“时量”的意思（例C）,因此“while +S + be +V-ing…”在日常英语中是很常用的句式（例D）.
“as”表达时间时最常用于表达两种动作的相继发生（例E）或平行发生（例F）.
表示两动作的“在先”或“在后”通常都使用“before”“after”（例G,H）.表示时间的“till”和“until”意思相同,可以代换使用（例I）,不过用于句首时只能使用“Until”（例J）.
“since”是表示“自从……”的意思（例K）.
“the moment/instant”也是表达时间的从属连词,表示“一……就立即……”的意思（例L）,与“as soon as （例M）”同义.
例N的“as/ so long as ”在现代英语以“as long as”较为普通.
例O的“whenever”是表示“every time when”（每……的时候）”的意思.
（2）场所（Place）
表达场所的从属连词有：where, wherever
例：Where there is a will ,there is a way． ----Proverb．
（有志者事竟成.——格言）
例：Sit wherever you like, please．
（你喜欢哪儿就坐哪儿.）
（3）原因（Cause）,理由（Reason）
表达原因、理由的从属连词有：because ,as ,since, seeing （that）,now（that） ,etc．
例：He has few friends because he is selfish．
（他几乎没有朋友是因为他自私.）
例：As I got up late ,I came to school without my breakfast this morning．
（因为我起床晚,今天早晨我没吃早饭就来上学了.）
例：Since you are a friend of my younger brother's I'll come to your help．
（既然你是我弟弟的朋友,我愿意来帮你忙.）
例：Seeing that he was there ,he may have seen her．
（他既然也在那里,他可能和她见了面.）
例：Now（that） the exam is over, you can go to the movies this evening．
（既然已经考完了,今天晚上你就可以去看电影.）
解说 表达原因、理由最常用的从属连词就是“because”,但是在用法上应注意下列三点.
①“for”与“because”的区别
（a）“for”是并列连词,所以由“for”连接成的句子是并列句；“because”是从属连词,所以由“because”连接成的句子是复合句.
例：He speaks English well for he comes from the Untied States．
（他英语讲得好,因为他是美国人.——并列句）
He is hungry because he didn't have breakfast this morning．
（他饿是因为他今天早上没吃早餐.——复合句）
（b）“because…”可用在句首,“for…”则不可以.
For he comes from…（误）
Because he didn't have…（正）
（c）“for…”是表示补述原因,“because…”是表示直接原因.
例：He is in good health for he keeps early hours．
（他身体健康,因为他早睡早起.——早睡早起只是在补述前面从句的“He…health”,不是“He…health”的直接原因,所以本句用“for”而不用“because”.
例： He was punished because he cheated in the examination．
（他因考试作弊而被处罚了.——考试作弊是被处罚的直接原因,所以用“because”而不用“for”.）
②“because…”是从句,不能作为句子（这是中国学生常犯的错误.）
例：He felt tired．Because he had walked a long way．（误）
（他觉得疲倦,因为他走了很长的路.）
He felt tired because he …（正）
Because …,he felt tired．（正）
不过在回答“Why…”时,“Because…”可以单独作句子.
例：Why did you have a quarrel with him?
（你为什么和他吵架了?）
Because he called me names．（正）
（因为他骂我.）
③“because”引导的是从句,“because of ”是短语介词,只能取宾语.
例：The game was called off because it rained．
（那场球赛被取消是因为下了雨.） 例：Because of the rain, the game was called off．
（因雨那场球赛被取消了.）
（4）because与as, since的区别
“as”和“since”表示原因理由时,通常都用于指对方或读者已知或可推知的原因和理由,此种用法尤其常见于日常对话英语.
例：As it's raining again, we'll have to stay（at） home．
（因为又下着雨,我们只好留在家里了.）
例：Since he had not paid his bill, his electricity was cut off．
（既然他不付电费,他的电就被切断了.）
----PEU,Michael Swan
相对地,“because”就用于指对方或读者不知的原因或理由. 例：Why were you late for school this morning?
（今天早晨你为什么上学迟到了.）
Because I had an accident on my way to school．
（因为我在上学途中发生了车祸.）
“seeing（that）; now（that）”的用法及其所表示的意思与“since”相同,“that”常省略.
（5）目的（Purpose）
表达目的的从属连词有：（so）that, in order that, 通常和“may/might…”连用.
例A：She saves some money every month that she may go to the United States for advanced studies．
（她每个月储蓄一些钱目的是要赴美国留学深造.） 例B：He started early（so） that he might catch the first train．
（他出发早为的是要赶上第一班火车.）
例C：I practiced and practiced in order that I could win the first prize．
（我反复不断地练习,目的就是要得第一名.）
解说 主句的动词若是一般现在时（如例A）,表目的的从句用“that…may +V…”,若是过去时（如例B）,就用“that…might +V…”.表示目的的从句在日常英语中也常使用“can/could +V…（例C）”.
（6）结果（Result）
表达结果的从属连词有：so …that,such…that.
例A：He is so lazy that he has failed in the examination again．
（他如此懒惰,所以他又没考及格.）
例B：He ran- so fast that nobody could catch him．
（他跑得如此地快,结果没有人能捉住他.）
例C：He asked us such a hard question that nobody present could give a correct answer to it．
（他问了如此难的问题,结果在场的人没有一人能给出正确的答案.）
解说 表示结果的句式是：“so + Adj．（例A）/Adv．（例B） +that…”和“such a +Adj．+N +that or such + Adj．+N（e） s+ that ”.这两个句式可以通用,例如：
He is such a lazy student that…
He was such a fast runner that…
He asked us so hard a question that…
（7）条件（Condition）
表达条件的从属连词有：if, unless, supposing/ suppose（that） ,in case （that）, provided（that） ,etc．
例A：She won't go if it rains tomorrow．
（如果明天下雨她就不去.）
例B：If I had wings, I could fly like birds．
（如果我有翅膀,我就能如鸟一般地飞.）
例C：She will go unless it rains tomorrow．

as
ad.
1. 跟...一样地,同样地
Sam is as rich as Alexander.
山姆像亚历山大一样富有。
2. 如同;例如
Such animals as foxes and squirrels have bushy tails.
有些动物,如狐和松鼠,有蓬松的尾巴。
prep.
1. 作为,以...的身...

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as
ad.
1. 跟...一样地,同样地
Sam is as rich as Alexander.
山姆像亚历山大一样富有。
2. 如同;例如
Such animals as foxes and squirrels have bushy tails.
有些动物,如狐和松鼠,有蓬松的尾巴。
prep.
1. 作为,以...的身份
She works as an interpreter in that company.
她在该公司里担任翻译员。
2. 当作
She didn't think much of him as a painter.
她对他作为一位画家评价不高。
3. 像;如同
The old woman was dressed as a young lady.
这位老妇人打扮得像一位年轻人。
conj.
1. 像...一样;依照;像
You ought to do as Paul tells you.
你应按照保罗吩咐的做。
The work is not so difficult as you imagine.
这工作不像你想像的那么困难。
2. 当...时
As she left the room she remembered that book.
她离开房间时想起了那本书。
3. 随着
As the sun rose the fog dispersed.
太阳一出来,雾随之消失。
4. 因为
We didn't know what to do as we were just visiting there.
我们不知道该怎么办,因为当时我们仅仅在那里作访问。
5. 虽然
Tired as he was, he sat up late.
他虽然疲倦,可仍然很晚才睡。
pron.
1. (与such,the same,as等连用,引导关系从句)与...相同的事物(或人)
He has earned as much money as I have.
他赚的钱和我赚的一样多。
She felt just the same as he did.
她和他的感受相同。
There is a general rise in prices such as occurred in the late 60's.
物价普遍上涨,跟六十年代末一样。
2. (引导从句,对前述内容作补充)本情况,该事实
She has married again, as was expected.
她已再婚,这是意料中的事。
We are tired, as anyone can see.
我们累了,这是有目共睹的。
since
ad.(常用于现在完成时或过去完成时)
1. 此后;从那时到现在
She left school three years ago and has worked as a nurse ever since.
她三年前毕业,从那时起便一直当护士。
2. 之前,以前
prep.
1. (常用于现在完成时或过去完成时)自...以来,从...至今
I haven't heard from him since last year.
我自去年以来未曾收到过他的信。
conj.
1. (常用于现在完成时或过去完成时)自...以来,从...至今
It's been ten years since they married.
他们结婚到现在已经十年了。
She has been living a hard life since her husband died.
她自从丈夫死后,一直过着艰苦的生活。
2. 既然;因为,由于
He must have taken the book since it isn't here.
他一定是把书拿走了,因为书已不在这里了。
Since it is so hot, let's go swimming.
既然天气这么热,我们去游泳吧。

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as是作为
since是自从
as是定语从句的关联词，since可以连接现在完成时。
A呀嘛呀，太多了

as是副词,since是介词