As…As：相等测试
两件事物可以相等——和你一样高——也可以不同——比你高。一个小词对说"相同"，另一个说"不相同"。
相等与不同
相同，还是不相同？
英语有一种不用排名的清晰比较方式：as + adjective + as 表示相等，not as + adjective + as 表示不同。当一方明显更多时，就用 than。
相等：as + adj + as
同级，没有 -erI am as tall as you
不相等：not as + adj + as
比另一个少I am not as tall as my brother
更多：adj-er + than
明显更多My brother is taller than me
as…as 里面不加 -er
形容词保持原级This car is as fast as yours
⚠️ as…as → 同级。-er than → 更多。not as…as → 更少。
公式
三行，一个思路
三者都以同样的方式比较：subject + be + 比较部分 + 另一个事物。只有中间部分变化。
Sheisas tall asher mother
This bookisnot as interesting asthat one
Heisolder thanhis sister
常见错误
搞混两者的四种方式
陷阱都来自混用两个体系：-er 偷偷溜进 as…as，than 代替了第二个 as，like 顶替了 as。
She is as taller as me.
She is as tall as me.
💡 as…as 用原级形容词——不加 -er。
This is not as cheap than that.
This is not as cheap as that.
💡 搭配是 as…as。这里没有 than 的位置。
He is as tall like me.
He is as tall as me.
💡 这个词是 as，不是 like。
He is more tall as me.
He is taller than me.
💡 More 就是 -er，它用 than 来比较：taller than。
快速测验
测测你刚学到的东西
三分钟，五道题——看看记住了多少。放心，没有作文题。
She is ___ tall as her sister.
💡 附加信息2 个部分
实用短语
as…as 在生活中的用法
有些 as…as 短语太常见，已经像一个词了。学会它们，你会到处听到。
as soon as possible（尽快）
非常快——ASAP
Please call me as soon as possible
as much as you want（想多少就多少）
没有限制
Eat as much as you want
as fast as you can（尽可能快）
全速
Run as fast as you can!
as cold as ice（像冰一样冷）
明喻——一种常见句式
Her hands are as cold as ice
⚠️ 这些是固定搭配——把它们当作一个整体来学，不要逐词拆开。
我该用哪一个？
一个问题就能决定
不确定该用 as…as 还是 than？问自己一个问题，答案就会替你选好。