①.than 解释为“比”
比较级+than+被比较的事物
e.g . I‘m taller than you.
②.as + 形容词或副词原级 + as（否定句或疑问句中用so… as.）
e.g . He cannot run so/as fast as you.
注意：（1）当as… as 中间有名词时：as +形容词+ a +单数名词
（2）用表示倍数的词或其他程度副词做修饰语时,放在as的前面.
This room is twice as big as that one.
（3）倍数+ as + adj. + as 倍数+ then + of
This bridge is three times as long as that one.
This bridge is three times the length of that one.
③.可修饰比较级的词
1）a bit,a little,rather,much,far,by far,many,a lot,lots,a great deal,any,still,even等
2）还可以用表示倍数的词或度量名词作修饰语.
3）以上词（除by far）外,必须置于比较级形容词或副词的前面.
注意：如果后接名词时,much more +不可数名词
many more +可数名词复数
（1）old 有两种比较级和最高级形式：older/oldest 和elder/eldest. elder,eldest 只用于兄弟姐妹的长幼关系.
（2）far 有两种比较级,farther,further. 在英语中两者都可指距离.
I have nothing further to say.
④.the more...the more...越越结构,解释为“越怎样……就越怎样”
e.g. The more you learn, the more you know.