（1）两者相比，甲=乙，用“as +形容词或副词原级+ as”。
He is as tall as I/me.他和我一样高。
He got up as early as I did.他和我起得一样早。
注：
当as…as中间有名词时，名词要放在形容词之后。
This is as good an example as the other is.这个例子和另外一个一样好。
I can carry as much paper as you can.你能搬多少纸，我也能。
（2）两者相比，甲＜乙，用“not as/so+形容词或副词原级+as”。
He cannot run so/as fast as you.他没你跑得快。
Corn doesn't need as/so much water as rice.玉米不需要稻谷那么多水。
（3）两者相比，甲＞乙，用“比较级形容词或副词+ than”。
You are taller than I.你比我高。
He reads more careful than I.他比我看书更认真。
（4）多者比较，用“the+最高级+比较范围”。
Tom is the tallest in his class.汤姆是他班里个子最高。
Kate wrote (the) most carefully of all.凯特是所有人中写得最认真的。
