同学你好，该知识点来自沪江网校《英语零基础直达大学四级【周年庆特惠班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好：
1、as ... as 的意思是“与......一样”。
2、接形容词或副词的原级；在否定句中，第一个 as 也可换成 so。如：
He doesn't study as [so] hard as his brother. 他学习不如他弟弟努力。
3、表示涉及数量或程度，可用“as much+不可数名词+as”和“as many+可数名词复数+as”。如：
He doesn’t pay as much tax as we do / as us. 他没我们交的税款多。
4、可用(not) nearly, almost, just, nothing like, exactly, not quite, half, one-ten, twice, three times, 30 per cent等修饰，并且这些修饰语必须置于第一个as之前，而不能置于其后。如：
This room is twice as large as that one. 这个房间是那个房间的两个大。
5、as…as…不表示比较的几个常见句型。
1）as…as possible／sb. can  尽可能的……
Please answer my question as soon as possible．
请尽快回答我的问题。
The detective is searching the man as carefully as he can．
那个侦探正在尽可能仔细地搜查那个男子的身体。
2)as…as usual／before  像往常/以前一样……
She looks as pretty as before．
她看起来和以前一样漂亮
Though they failed，they still worked as hard as usual．
尽管他们失败了，但他们仍像以前一样努力工作。
3）as long as只要，引导条件状语从句
I will stay with you as long as there is a room flree．
要是你有一间空余的房子，我就住在你这里。
You may borrow this book as long as you promise to give itback．
只要你答应归还，你就可以把这书借走。

祝学习愉快!