1.原级的用法
表示双方在程度、性质、特征等某方面相等时，用“as+原级形容词/副词+ as”的结构；表示双方不相等时，用“not so(as)+原级形容词/副词+ as”的结构；表示一方是另一方的若干倍时，用“倍数+ as+原级形容词/副词+ as”的结构。
Xiao Wang is as tall as Xiao Yu.
This building looks not so (as)high as that one.
Miss Xu speaks English as fluently as you .
