as~as…

・"as~as…"で、「~と同じくらい…」
・"as"と"as"の間のには、形容詞か副詞がくる。
・2番目の"as"の後のには、目的格か文(比較の対象となる副詞節)が来る。
・2番目の"as"の後に"he"、"she"、"they"のような主格が単独で置かれることはない。

[正]She is as tall as him.
[誤]She is as tall as he.
[正]She is as tall as he is.
[正]She runs as fast as him.
[誤]She runs as fast as he.
[正]She runs as fast as he does.
[正]She ran as fast as she could.
[誤]She ran as fast as she can.
[正]He's gone just as fast as he came in.

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