专升本英语考点：as...as的用法及常见句型

　　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 youthink.这本字典不如你想象的那样有用。

　　若有修饰成分，如twice, threetimes, 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。

　　as...as的常见句型：

　　(1)as...as possible

　　Please answer my question as soon aspossible.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 carryout 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 stationyesterday 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。