He took a rest from the company because it was a severe sickness. [Syntax]
📖 解説とニュアンス
The correct answer is "な". This sentence uses the causal pattern "~なので" (because ~). When a noun, like "病気(びょうき)" (illness), or a な-adjective connects to "ので", it requires "な" between them to form a grammatically correct phrase. Thus, "ひどい病気(びょうき)なので" correctly means "because of a severe illness". "ひどい" is an i-adjective modifying "病気" and is already present. "病気" is a noun already present. "ので、" is the causal conjunction itself and comes after the blank.
正解は「な」です。「〜なので」の形は、名詞やな形容詞に接続する場合「な」が必要です。「病気」は名詞なので「病気なので」となります。「ひどい」と「病気」はすでに文中にあり、「ので、」は「な」の後ろにくる接続詞のため不適当です。
📝 実践例文
彼(かれ)は 会社(かいしゃ)を ひどい 病気(びょうき) な ので、 休(やす)みました。
He took a rest from the company because it was a severe sickness. [Syntax]
理解度テスト
本番レベルの問題で「な」の定着度を確認しよう
Explanation (EN): The correct answer is \"な\". This sentence uses the causal pattern \"~なので\" (because ~). When a noun, like \"病気(びょうき)\" (illness), or a な-adjective connects to \"ので\", it requires \"な\" between them to form a grammatically correct phrase. Thus, \"ひどい病気(びょうき)なので\" correctly means \"because of a severe illness\". \"ひどい\" is an i-adjective modifying \"病気\" and is already present. \"病気\" is a noun already present. \"ので、\" is the causal conjunction itself and comes after the blank.
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