1.词义： as ...as... 和....一样...
not as...as...和...不一样...； 不像那样
2.考点：as ...as...中间用形容词或副词的原级，用于肯定句
not as ...as...中间也是用原级，用于否定句
考题：(2010无锡中考题, 14题) He spends as much time reading as he does writing.
3.必背例句：
I think English is as important as maths.
我认为英语和数学一样重要。
For me, basketball is as interesting as football.
对于我来说，篮球和足球一样有趣。
That classroom is not as large as this one.
那个教室没有这个教室大。
4.拓展：
as... as还可用在许多固定说法中：
as brave as a lion 勇猛如狮
He may be small and not very strong , but hes as brave as a lion.
他个子或许矮小，身体也不够强壮，但非常勇敢。
as busy as a bee. 像蜜蜂一样忙碌 ; 非常忙碌
My mother is always as busy as a bee .
我妈妈总是很忙。她总是像蜜蜂一样忙碌。
as bright as day 犹如白昼(注意：day前无a）
as fat as a pig 肥得像猪一样