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as的用法小结
英语是按照分布面积而言最流行的语言，但母语者数量是世界第三，仅次于汉语、西班牙语。它是学习最广泛的第二语言，是近60个主权国家的官方语言或官方语言之一。下面为大家带来as的用法小结，快来看看吧。
as的用法小结
1.Child as[though]he was, he did quite well. 他虽是个孩子，但已干得很不错。
2. 用作关系代词，主要用法有二。如：
(1) 用在such, same, as等之后，引导限制性定语从句。如：
This is thesame watch as I lost. 这块表跟我丢失的那块一样。
Such men as (=Those men who) heard of him praised him. 听说过他的人都赞扬他。
(2) 单独用作关系代词，引导非限制性定语从句，可放在主句之前 (常译为：正如)或之后 (常译为：这一点)，且主从句之间一般要用逗号隔开。如：
He was absent, as is often the case. 他缺席了，这是常有的事。
As was expected, he succeeded at last. 正如我们所料，他终于成功了。
3. 用来表示目的，下面两种句子结构都可以。如：
仔细写以便把每句话都写清楚。
正：Write carefully so as to make every sentence clear.
正：Write so carefully as to make every sentence clear.
4. 在正式文体 (尤其是文学体裁)中，as后可用倒装语序表示“…也一样”这类意思 (现代英语通常so表示这一用法)。如：
He travelled agreat deal, as did most of his friends. 他去过许多地方旅游，他的多数朋友也是一样。
He plays the piano, as does his mother. 他会弹钢琴，他母亲也会。
注：用作连词，表示原因 (参见because)，表示时间 (参见when)。
5. 用于 as if
as though, 意为“仿佛”、“似乎”。两者一般可通用 (但注意不能说 as although)。用法上注意几点：
(1) as if [though] 可引导状语从句和表语从句，从句谓语根据语义的要求，可用陈述语气 (若可能为事实)或虚拟语气 (若为假设或不太可能是事实)。如：
It looks as if it is going to rain. 天似乎要下雨了。
It seems as if you’re right. 似乎你是对的。
He talks asthough he knew everything. 他夸夸其谈，好像无所不知。
When apencil is partly in a glass of water, it looks as if it werebroken. 当把一支铅笔的一部分放在一杯水里时，它看起来好像折断了似的。
当主句谓语是过去时态时，从句谓语常可用陈述语气。如：
He pausedas though he found a difficulty. 他停了下来，似乎遇到了一个难题。
She felt as if she lost something. 他觉得似乎丢了什么东西。
(2) 当从句主语与主句主语一致，且从句谓语中又包括有动词be时，从句主语及其谓语中的动词be通常可以省去。如：
From time to time heturned round as though (he was) searching for someone. 他不时地四下张望，好像在找人。
He opened his mouth as if (he was)to speak. 他张开口，好像要说话似的。
6. 关于 as…as, 用法注意：
(1) 中间只能用形容词或副词的原级，不能用比较级或最高级。如果在第二个as之后使用独立的人称代词，一般说来用主格 (较正式)或宾格 (非正式)均可。如：
He’s as old as she
her. 他年纪跟她一样大。
注意：
要是第二个as之后的人称代词跟有谓语动词，则该人称代词只能用主格。如：
He is as old as she is.
但是有时用主格或宾格含义差别很大。如：
You love him as much as I (=as I love him). 你爱他像我爱他一样。
You love him as much as me (=as you love me). 你爱他像爱我一样。
(2) 在肯定句中用as…as, 在否定句中用not as…as或not so…as 均可。如：
He doesn’t study as [so] hard as his brother. 他学习不如他弟弟努力。
(3) 要注意比较对象的一致性，即比较的双方必须是可以比较的的同类人或物，否则会出错。如：
正：The population of China is much larger than that of Japan. 中国人口比日本人口多得多。
误：The population of China is much larger than Japan.
(此句错在将 the population of China 与 Japan 来比较，比较对象不一致)
(4) 如果涉及数量或程度，可用以下两个结构。如：
①as much+ (不可数名词+) as
②as many+ (可数名词复数+) as
You must speak English as much as possible. 你必须尽可能地多说英语。
You’ve made as many mistakes as I have. 你犯的错误和我犯的一样多。
(5) 请注意下列结构的词序。如：
她和她妈妈一样是位好厨师。
正：She is a cook as good as her mother.
正：She is as good a cook as her mother.
误：She is as a good cook as her mother.
(6) 修饰as…as结构的常见词语有nearly, almost, just, exactly, half, quite, twice, three times等，请注意这些修饰语都只能放在as…as 结构之前 (而不能置于其中或其后。如：
This rope is twice aslong as that one. 这根绳子比那根长一倍。
(7) as…as结构的下列用法，属于“异质比较” (注：主、从句的主语和谓语一致时，从句的主语和谓语有时可以省略)。如：
The room is aslong as (it is) wide. 这房间的长宽尺寸一样。
The news was asunexpected as (it was) welcome. 这消息来得突然，但受人欢迎。
She is as clever as (she is) beautiful. 她既聪明又漂亮。
Oneis as light as the other is heavy. 一个轻，另一个重。
(8) as…as结构在一定的上下文中可以用其省略结构 (即省去其中的一个 as)。如：
She’s clever, but her brother is just as clever. 她很聪明，但她兄弟也一样聪明。
The woman married a man pooras herself. 这个女人嫁给了一个与她一样穷的男人。
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拓展：with的用法总结
一、with结构作定语，修饰前面的名词(可以是紧跟的名词，也可以是不紧跟的名词，)作定语，带有.....的特征。
1、 with结构修饰名词，with作后置定语，不紧跟前面名词的情况。
例，Bihar is India's poorest state, with an annual per capita income of $111, lower than that of the mostimpoverished countries of the world.
with结构修饰Bihar
2、with结构修饰名词，紧跟名词的情况。
例，Under the restructuring, the huge organization that operates the company's basic businesses will be divided into
five groups, each with its own executive.with结构修饰each (group)
二、作原因状语，解释为，由于，因为。
例，With total sales of less than three hundred dollars and fewer new subscribers than last year, the New England
Theatre Company is in danger of losing its building.
三、作伴随或结果状语，表示伴随的情况或结果。
1、with作伴随状语
曼哈顿论坛Ron对with作伴随状语的解释：
It appears that "with" may be used with a present participle (-ING form) to represent
circumstances that are contemporaneous with the action described in the main clause
大意是，with引导的状语，与主句动词动作同时发生。
四、【表示使用的工具，手段】用，以，借，在……的帮助下。语法作用：修饰动词。
with解释为，在……的帮助下。修饰动词producing
Dolphins lack vocal cords, but they do create sounds, producing a complicated system of whistles, squeaks, moans, trills and clicks with sphincter muscles inside the blowhole.
海豚缺少声带。但是它们确实能产生声音，在喷水孔内部的括约肌的帮助下，产生一系列复杂的由汽笛声，吱吱声，呻吟声，颤音，和咔哒声组成的复杂声音系统。
with解释为，用……，修饰动词portray
George Sand was one of the first European writers to consider the rural poor
legitimate subjects for literature and to portray them with sympathy and respect in her novels.
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