EigoPro 3級 文法 — as ~ as 同等比較

3級フォーマット (4択15問) as ~ as 同等比較 — as 原級 as, not as ~ as, as soon as / as long as / as far as / as well as, the same as

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この単元の問題を3問、解説つきで公開しています

3級 · 文法 · 全15問

問 1

Tom is as （　） as his brother.

  • more tall
  • tall
  • taller
  • tallest
Pattern

as + 原級 + as (同等比較の基本)

3級文法as ~ as 同等比較基本型
⚡ひとことで

as + 形容詞/副詞 (原級) + as = 「〜と同じくらい…」。比較級 (-er) ではなく原級を挟む。

選択肢の解説Choice Analysis
正解

"Tom is as ~ as his brother." は同等比較の基本 = 「tall」。型: as + 原級 (形容詞・副詞の元の形) + as = 「〜と同じくらい…」。重要ルール: as と as の間は 原級 (tall, big, fast, careful) ━ 比較級 (taller) や最上級 (tallest) は ✗。意味: 「トムは弟と同じくらい背が高い」━ 2つを比較して「等しい」ことを表す3級の必修パターン。

  • 「taller」

    = as ~ as は原級 ━ 比較級 taller は than と組む。

  • 「tallest」

    = as ~ as は原級 ━ 最上級は the と組む。

  • 「more tall」

    = 二重誤り ━ 原級 tall が正しい。

▦活用 (主語別 / 時制別)
形マーカー例
肯定 (同等)as + 原級 + asas tall as his brother
否定 (より劣る)not as + 原級 + asnot as tall as
not so ~ as (古風)not so + 原級 + asnot so tall as
副詞as + 副詞 + asas fast as
反対概念比較級 + thantaller than (異なる)
▦文型バリエーション
文型形例
肯定 同等A is as + 原級 + as + BTom is as tall as his brother.
否定 不同等A is not as + 原級 + as + BTom is not as tall as his brother.
疑問Is A as + 原級 + as + B ?Is Tom as tall as his brother?
❝例文

  • Tom is as tall as his brother.

    トムは弟と同じくらい背が高い。

  • This bag is as heavy as that one.

    このカバンはあれと同じくらい重い。

  • She is as kind as her mother.

    彼女は母親と同じくらい優しい。

  • Today is as hot as yesterday.

    今日は昨日と同じくらい暑い。

  • My phone is as new as yours.

    私のスマホはあなたのと同じくらい新しい。

💡Tip · 覚えるコツ
  • as ~ as の3大注意点 (3級必修)

    ★ ①

  • as と as の間は必ず原級

    "as tall as" (○) / "as taller as" (✗) / "as tallest as" (✗) ★ ② 形容詞も副詞も同じ枠: as tall as (形容詞) / as fast as (副詞) どちらも as + 原級 + as ★ ③ as の後の代名詞: 主格 ("as tall as I am" フォーマル) または目的格 ("as tall as me" カジュアル) どちらもOK。意味のニュアンス: as ~ as = 「ほぼ等しい」(差なし)、比較級 = 「差あり」、less than = 「劣る」━ 3者の意味の違いを明確に

問 2

This book is not as （　） as that one.

  • interesting
  • interestinger
  • more interesting
  • most interesting
Pattern

not as + 原級 + as (劣等比較)

3級文法as ~ as 同等比較否定
⚡ひとことで

not as + 原級 + as = 「〜ほど…でない」(劣等比較)。less ~ than とほぼ同義。

選択肢の解説Choice Analysis
正解

"This book is not as ~ as that one." は否定の同等比較 = 「interesting」。否定の型: not + as + 原級 + as = 「〜ほど…でない」(A は B より劣る)。意味の比較: "A is as interesting as B" (同じくらい面白い) ↔ "A is not as interesting as B" (B ほど面白くない)。less と等価: "not as interesting as" ≈ "less interesting than" ━ どちらも「より〜でない」を意味。

  • 「more interesting」

    = as ~ as は原級 ━ more は比較級。

  • 「most interesting」

    = as ~ as は原級 ━ 最上級は the most。

  • 「interestinger」

    = long adj に -er 不可 ━ 原級 interesting が正しい。

▦活用 (主語別 / 時制別)
形マーカー例
肯定as + 原級 + asas interesting as
否定not as + 原級 + asnot as interesting as
古風not so + 原級 + asnot so interesting as
less + 原級 + than≈ not as ~ asless interesting than
差で言う比較級 + thanless interesting than
▦文型バリエーション
文型形例
否定A is not as + 原級 + as + BA is not as interesting as B.
古風A is not so + 原級 + as + BA is not so interesting as B.
lessA is less + 原級 + than + BA is less interesting than B.
❝例文

  • This book is not as interesting as that one.

    この本はあの本ほど面白くない。

  • She is not as tall as her sister.

    彼女は姉ほど背が高くない。

  • Today is not as hot as yesterday.

    今日は昨日ほど暑くない。

  • My car is not as fast as his.

    私の車は彼のほど速くない。

  • This test is not as difficult as the last one.

    このテストは前回ほど難しくない。

💡Tip · 覚えるコツ

not as ~ as の3つの言い換え (3級準2級頻出) ━ ★ "A is not as interesting as B" (一番標準) ★ "A is less interesting than B" (less + 原級 + than) ★ "B is more interesting than A" (主語を入れ替えて比較級) ━ どれも「A は B より面白くない」=「B の方が面白い」を意味。口語と書き言葉: not as ~ as は会話で頻出 / less ~ than は書き言葉でフォーマル。not so ~ as 古風: "not so tall as" は古風な英語、現代英語では not as ~ as が標準。

問 3

I will call you （　） I get home.

  • as well as
  • as far as
  • as long as
  • as soon as
Pattern

as soon as (〜したらすぐに)

3級文法as ~ as 同等比較as soon as
⚡ひとことで

as soon as + 主語 + 動詞 = 「〜したらすぐに」。時を表す接続詞、副詞節は現在形 (未来でも will 不可)。

選択肢の解説Choice Analysis
正解

"I will call you ~ I get home." は時の副詞節 = 「as soon as」。as soon as = 「〜するとすぐに」━ 時を表す接続詞で、後ろに節 (主語 + 動詞) を取る。重要ルール: 副詞節 (as soon as の節) の中では 未来でも現在形 ━ "as soon as I get home" (○) / "as soon as I will get" (✗)。意味: 「家に着いたらすぐに電話する」━ 4級〜3級の頻出パターン。

  • 「as far as」

    = = 「〜する限り」 ━ 範囲・距離の表現。

  • 「as long as」

    = = 「〜する間/限り」 ━ 条件・時間の長さ。

  • 「as well as」

    = = 「〜も同様に」 ━ 追加列挙。

▦活用 (主語別 / 時制別)
形マーカー例
as soon as (〜したらすぐ)as soon as + S + V (現在)as soon as I get home
as long as (〜する限り)as long as + S + Vas long as you study
as far as (〜する限り)as far as + S + Vas far as I know
as well as (〜も)as well as + 名詞/句Tom as well as Bob
時制ルール副詞節は現在形as soon as I arrive (○)
▦文型バリエーション
文型形例
未来I will + V + as soon as + S + V (現在)I will call as soon as I arrive.
過去S + V (過去) + as soon as + S + V (過去)He left as soon as he heard.
命令Do + V + as soon as + S + VCall me as soon as you get home.
❝例文

  • I will call you as soon as I get home.

    家に着いたらすぐに電話する。

  • He left the office as soon as he finished his work.

    彼は仕事が終わるとすぐに会社を出た。

  • Please reply as soon as you can.

    できるだけ早く返事してください。

  • As soon as the bell rang, the students stood up.

    ベルが鳴ると生徒たちはすぐに立ち上がった。

  • She fell asleep as soon as she lay down.

    彼女は横になるとすぐに眠った。

💡Tip · 覚えるコツ

as ~ as の慣用フレーズ集 (3級準2級必修) ━ ★ as soon as = 「〜するとすぐに」(時): "as soon as I get home" ★ as long as = 「〜する限り/間」(条件): "as long as you study, you will pass" ★ as far as = 「〜する限り/まで」(範囲・距離): "as far as I know" (私の知る限り)、"walk as far as the station" (駅まで歩く) ★ as well as = 「〜と同様に/も」(追加): "He speaks English as well as French." ★ as much as / as many as = 「〜と同じくらい多く」(量・数)。時制ルール再確認: as soon as / as long as の副詞節は 現在形 (未来でも will 不可)。

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