as_用法归纳VIP专享

1. as...as 的用法 as...as 意为"和……一样"，表示同级的比较。使用时要注意第一个 as为副词，第二个 as 为连词。其基本结构为：as+ adj./ adv. +as。例如： (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 ****er 像黄油一样软 as rich as a Jew 像犹太人一样富裕 2. as 用作连词引导时间状语从句 as 与 when，while 都是引导时间状语从句的从属连词，含义都是"当……的时候"。但它们有区别：用 when 时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用 while 时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用 as 时，主句和从句的动作同时发生，具有延续的含义。例如： (1)It was snowing when he arrived at the construction site.他到达工地时，天正在下雪。 (2)He was watching TV while his mother was cooking.他母亲做饭时他在看电视。 (3) Y...