1、as 句型：
(1) as引导方式状语从句句型：“按照……；正如……”
例：We do farm work as the old peasant teaches us.
As(it is)in your country, we grow wheat in the north and rice in the south. 正如(像) 你们国家一样，我们北方种植小麦，南方种植水稻。
(2) as＋形容词／副词原级＋（a ／an）＋名词＋as ;
否定式：not as/so --- as
例：He is as good a player as his sister．
他和他姐姐一样是位优秀的运动员。
