高校入試対策英語「語形変化の対策問題」です。高校入試の英語で頻出の「語形変化」問題は、単語の意味だけでなく文法知識や適切な形への変換力が試される重要なポイントです。動詞の時制、名詞の複数形、形容詞・副詞の比較級や最上級、さらには派生語（動詞→名詞、形容詞→副詞など）など、幅広い知識が必要になります。
この記事では、よく出るパターン別の例題を紹介し、効果的な解き方を解説します。確実に正解を導き出すために、語形変化のルールをしっかりと身につけ、入試本番での得点アップを目指しましょう！
【問題】語形変化の対策問題
【問1】次の各文の( )内の動詞を適切な形にしなさい
(1) Would you mind (shut) the window?
(2)The girl (lie) on the grass is my cousin.
(3) I thought that my father (come) home by four.
(4) Wait here until he (come) home.
(5) How long have you (keep) your cat?
(6) Most of the homework (be) done last night.
(7) I bought a book yesterday, so I (show) you it tomorrow.
(8) We asked him (write) to Mr. Miller.
(9) She (be) in our office since ten o’clock.
[問2] 次の語を( )内の指示に従って書きかえなさい。
(1) possible (反意語)
(2) song (動詞)
(3) sick (同意語)
(4) busy (名詞)
(5) poor (反意語)
(6) lives (単数形)
(7) kind (名詞)
(8) bad (最上級)
(9) anger (形容詞)
(10) autumn (同意語)
(11) normal (反意語)
(12) swim (ing形)
(13) honest (反意語)
(14) foot (複数形)
(15) take (反意語)
(16) easy (副詞)
[問3] 次の各文の( )内の語を適切な形にしなさい。
(1) John works as (hard) as Harry.
(2) My father gets up the (early) of all my family.
(3) The boy can play the piano (well) than you.
(4) This is (a very small) radio I have ever had.
【解答】語形変化の対策問題
【問1】
(1) shutting
(2) lying
(3) came(would come)
(4) comes
(5) kept
(6) was
(7) will show
(8) to write
(9) has been
【問2】
(1) impossible
(2) sing
(3) ill
(4) business
(5) rich
(6) life
(7) kindness
(8) worst
(9) angry
(10) fall
(11) abnormal
(12) swimming
(13) dishonest
(14) feet
(15) give
(16) easily
【問3】
(1) hard
(2) earliest
(3) better
(4) the smallest
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