as……as用法：中间加形容词和副词原级。○1和…一样… His room is as big as mine.
He runs as fast as I do / me / I. You should keep the room as clean as your brother’s.
○2as…as possible / sb can “尽可能…” We went there as soon as possible.
Listen to the teacher as carefully as you can. He went there as quickly as he could.
○3有些短语有几个意思：as soon as 和…一样快;一…就…; as much as和…一样多;多达; as long as和…一样长;长达;只要; as well as和…一样好;和…一样;
as far as远达;就…来说 (as…as…在否定句中也可说so…as….)
也可表示倍数： This room is twice as big as that one. 这个房间是那个房间的两倍大。
.prefer用法：prefer sth to sth 或 prefer doing sth to doing sth.“比起…更喜欢…”
prefer to do sth rather than do sth宁愿…也不愿…
若单独一个prefer，和like 用法类似，后接 to do sth 或 doing sth “更喜欢做某事”
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