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。
(3) such + n. + as to do 如此……以致于……
例：she is such a fool as to believe what he said.
她是一个如此的一个笨蛋以致相信了他所说的话。
(4) so + adj./adv. + as to do sth 如此……以致于……
例：he was so strong as to carry the heavy box.
他是如此的强壮以致于能提起那重箱子。
(5) such --- as--- 象……之类的…… （接名词或定语从句）
例：he wished to be such a man as lei feng was.
他希望成为一个像雷锋这样的人。
(6) the same ＋名词＋as 和……一样的…… （接名词或定语从句）
例：he is not the same man as he used to be 他不是从前的那样子了。
(7) as 引导非限制性定语从句
例：as is known to us, knowledge is power.众所周知，知识就是力量。
(8)引导时间状语从句。与while意义相近
例：we get wiser as we get older. 随着我们长大，我们也变得越来越聪明。
(9) 引导原因状语从句，与because的用法相近
例：as it was getting very late, we soon turned back.
因为越来越迟了，所以我们不久就回来了。
(10) 引导让步状语从句
例：child as he is, he knows much about science.
尽管他是一个小孩，但他对科学了解得很多。
2、prefer 句型：
(1) prefer to do sth
例：i prefer to stay at home. 我宁愿呆在家里。
(2) prefer doing sth
例：i prefer playing in defence. 我喜欢打防守。
(3) prefer sb to do sth
例：would you prefer me to stay? 你愿意我留下来吗？
(4) prefer to do sth rather than do sth ……宁愿…...而不愿.…".
例句：i prefer to stay at home rather than go out