As + 形容詞 + as は、2人の人や2つのものが、ある点で同じくらいだということを表します。日本語の「〜と同じくらい…」です。形容詞は比較級（taller など）にせず、元の形のまま使います。
Tomáš is as tall as Sam.
トマーシュはサムと同じくらいの背の高さです。
The bus is as fast as the train.
バスは電車と同じくらい速いです。
not as … as
Not as … as は「〜ほど…ない」という意味で、最初のものが2つ目より劣ることを表します。
The bus isn't as fast as the train.
バスは電車ほど速くありません。
It's not as cold as yesterday.
昨日ほど寒くありません。
副詞と使う
I can't run as fast as you.
私はあなたほど速く走れません。
Come as quickly as you can.
できるだけ早く来てください。
as much と as many
不可算名詞には as much、複数形の名詞には as many を使います。
I don't have as much time as you.
私にはあなたほど時間がありません。
There weren't as many people as last year.
去年ほど人は多くありませんでした。
twice as, half as
「〜の2倍…」「〜の半分…」は as … as の前に twice, half を置きます。
This bag is twice as heavy as that one.
このかばんはあれの2倍重いです。
the same as
名詞と比べるとき、または形容詞がないときは the same as（〜と同じ）を使います。
Your phone is the same as mine.
あなたの電話は私のと同じです。
よくある間違い
- × She is as tall than me. → She is as tall as me.
- × as taller as → as tall as
- × He isn't so tall like me. → He isn't as tall as me.
- × the same like mine → the same as mine
Lingaku