as的用法有哪些？
as具体用法如下：
1.as用作副词时主要用来表示比较,意思是“像?一样；如同”。可以单独使用，但更多的是用在as...as结构中，其中第一个as是副词，其后可接形容词或副词,也可接其他成分，as前可有状语。第二个as可以是介词,也可以是连词。as用作副词时还可以指事物以同样的方式发生,意思是“和?一样”。
2.as 常做关系代词，如such children as love their books中的as是love的主语。
3.as还可表示原因,作“因为,既然”解，引导原因状语从句，表示不说自明的原因或理由，语气较轻，是附带提及，不加强调。as引导的从句可放在主句之前(表示原因不明显),也可放在主句之后(表示原因明显)。
as读音：英 [æz , əz] 美 [æz , əz]
释义：
1.prep.像;如同;作为;当作
例句：Nobody that I spoke to doubted his sincerity as a politician.
和我谈过话的人中没有一个怀疑他作为一个政治家的诚意。
2.adv.(比较时用)像?一样，如同;(指事情以同样的方式发生)和?一样
例句：Today, as usual, he was wearing a three-piece suit
像往常一样，他今天穿的是三件套。
3.conj.当?时;随着;照?方式;因为;由于
例句：She counted more than a dozen in plain sight as the steamer drew closer.
当轮船靠近时，她一眼就数出了十多艘来。
扩展资料
近义词：equally、though
一、equally读音：英 [ˈiːkwəli] 美 [ˈiːkwəli]
释义：adv.平等地;同样地;平均地;相等地;均等地;(引出同样重要的内容)同样，此外，也
例句：Team members contribute thoughts and share ideas equally.
团队成员平等地贡献思维和分享想法。
二、thoughthough读音：英 [ðəʊ] 美 [ðoʊ]
释义：
1.conj.虽然;尽管;即使;(用于主句后，引出补充说明，使语气变弱)不过，可是，然而
例句：I will say no more on these matters, important though they are
虽然这些事很重要，我也不想再说什么了。
2.adv.(尤用于句末补充说明，使语气减弱)不过，可是，然而
例句：I like him. Though he makes me angry sometimes
我喜欢他，不过他有时惹我生气。
(1)This film is as interesting as that one.这部电影和那部电影一样有趣。
(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。
其否定式为not as/so +adj./ adv. +as。例如：
This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。
若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。例如：
Your bag is twice as expensive as mine.你的袋子比我的贵一倍。
几个关于as...as的常见句型：
(1)as...as possible
Please answer my question as soon as possible.请尽快回答我的问题。
(2)as...as usual/before
She looks as pretty as before.她看起来和以前一样漂亮。
(3)as long as... (引导条件状语从句)
It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。
(4)as far as
He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。
(5)as well as
She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。
一些带有as...as结构的常见短语归纳：
as busy as a bee像蜜蜂一样忙碌
as easy as ABC像ABC一样容易
as deep as a well像井一样深
as light as a feather像羽毛一样轻
as soft as butter像黄油一样软
as rich as a Jew像犹太人一样富裕
