定義 / 解説
as ... as は同等比較、not as ... as は同等でない比較を表します。形容詞は中央に置きます（as tall as, not as fast as）。比較級（bigger など）とは別構文です。
主要ルール
- 形: as + adjective + as。
- 否定: not as + adjective + as。
- この構文内で比較級を使わない。
- 人・物・状況の比較に使える。
- 口語では後ろに目的格代名詞が来ることが多い。
例文
- She is as tall as me. - 彼女は私と同じくらい背が高いです。
- This bag is not as expensive as that one. - このバッグはあれほど高くありません。
- My room is as quiet as yours. - 私の部屋はあなたの部屋と同じくらい静かです。
- He is not as busy as last week. - 彼は先週ほど忙しくありません。
- Today is as cold as yesterday. - 今日は昨日と同じくらい寒いです。
よくある間違い
- ❌ She is as taller as me. -> ✅ She is as tall as me.
- ❌ This bag is not as expensive than that one. -> ✅ This bag is not as expensive as that one.
- ❌ My room is as quiet than yours. -> ✅ My room is as quiet as yours.