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求if 和 as if在使用上的区别,

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求if 和 as if在使用上的区别,
as [强 æz; 弱əz]
adv.
1. [表示程度]同样地,相同地,一样地,相等地,达到…程度
2. [后接形容词或分词]被认为,被看作是,(从某种方式)与…对比时
3. [后接 directed, agreed, promised 等分词]照…一样,按照(规定的、同意的、答应的)方式
4. 诸如,例如
conj.
1. [表示比较]像…(一样),达到…程度,以至于:
It flew straight as an arrow.
它直飞如箭.
You are as good as you think you are.
你像你自己认为的一样好.
2. [表示方式]以…的方式,按照;如同,如同…那样:
Do as you are told.
照吩咐去做.
Do as we do.
我们怎么干,你就怎么干.
3. [表示时间] 当…的时候,在…的同时,和…同时;当,正值:
She wept as she spoke.
她边说边哭.
Pay as you enter.
进来时付钱.
4. [表示原因]因为,由于,鉴于;既然:
As you object, we won't go.
由于你反对,我们不去了.
As you are leaving last, lock up.
你是最后一个离开,把门锁好.
5. [与so连用,表示结果或目的]:以至于,结果是:
The question is so obvious as to need no reply.
这问题很清楚,不必回答.
6. [表示让步,词序倒装]虽然,尽管,纵:
Tall as she was she couldn't reach the oranges.
她虽然长得这么高,仍够不着那些橙子.
Strange as it seems,it is so.
虽然看来很怪,但事实如此.
7. [口语][引导名词从句,在主从复合句的主句中]= that:
I don't know as I should.
我不知道我该这么做.
I don't know as I do.
我不知道我知道.
8. [与 so 连用,表示目的]为了,为使,以便:
Students should take notes so as to make revision easier.
为了便于复习,学生应该记笔记.
9. [常与 so 连用,表示比例或关系]正像;随着…:
As the wind blew harder,so the sea grew rougher.
风越刮越大,海浪也越来越汹涌.
10. 仿佛,好像( = as if):
It seems as she's never happy.
她似乎生活得一点也不愉快.
11. 根据;[与 go 连用]按照…的一般标准来说:
as far as it goes
就一般标准来说,就其本身来说
12. [口语][引导名词从句, = that]
13. [方言]比;与其…(不如…)( = than)
pron.
1. 如(情形或事实所表示);这一点,这一事实,那一情况
2. [用于比较,前为such 或 the same,或与后跟形容词的 as 连用,引导定语从句,等于who,which或that]照此;如;像…样的人(或事物);凡是…的人(或事物)
3. 也一样( = and so)
4. [方言][引导定语从句,= who,whom,which 或 that]
prep.
1. 当作;作为;以…的资格,以…的身份:
He poses as a friend.
他摆出一副朋友的样子.
I do not think much of her as a musician.
她作为一名音乐家,我认为不怎么样.
2. 像,如同,跟…一样:
The risk is as nothing compared to the gain.
所冒风险与所得相比不足挂齿.
The thief disguised himself as a policeman.
那贼乔装打扮成警察.
3. [表示比较]像…(一样):
as early as 1848
早在1848年
eyes as clear as crystals
水晶般明亮的眼睛
4. 例如:
a card game, as bridge
一种牌戏,例如桥牌
In some words in English the initial h is not sounded,as honour,hour,honesty,etc.
英语里有些词如 honour,hour,honesty等等的首字h不发音.
5. 为了…的目的:
I only said it as a joke.
我只是开玩笑说说而已.
6. 以…的形式:
We all start life as babies.
我们都是从婴儿开始人生的旅程的.
7. 由于…的理由[as being的省略形式]:
He was detained as suspects.
他因是嫌疑犯被拘留.
8. 起…的作用;(在剧中)扮演…的角色:
The illustration shows Mr.John as prince in Hamlet.
这个插图说明约翰先生在《哈姆雷特》一剧中扮演王子这个角色.
9. 当某人在…的时候:
As a child,he was rather naughty.
他小时候挺淘气.
as if
1. 好像,似乎,仿佛
2. [引导名词从句] = that
3. [引导无定形句,表示惊讶、不信任、愤懑等强烈感情]好像…似的,倒是…似的
例句:
In August, long stalks with several clumps of trumpet-like flowers suddenly appear as if by magic.
在八月份,长长的茎上有一小簇像喇叭状的花,变魔术般的突然出现.
That is why this idiom is used to describe ideas that are not realistic, as if they are dreams or fantasies.
那就是为什么这个习语是用来描述不切实际的想法的,那些(想法)就好像做梦和幻想一样.
Sorghum is still used widely today in Africa. Now it looks as if it might be part of the original family recipe.
到了今天,高粱在非洲仍为人们广泛食用.目前看来,它可能早已是人们家传食物秘方的一部分