ルール
Information that is needed to identify which person or thing you mean is essential and is not separated by commas. "That" introduces essential clauses.
どの人や物を指すかを特定するのに必要な情報は必須情報で、コンマで区切らない。thatは必須の節を導く。
✔ 正しい文： Students who study regularly tend to score higher.
✘ 誤った文： Students, who study regularly, tend to score higher.
→ 直し方： Remove both commas: the clause tells us which students.
コツ: If removing the words changes or confuses the meaning, they are essential: no commas.
練習：10問
Which choice completes the text so that it conforms to the conventions of Standard English?
AUSLEXが作成したオリジナルの解説と問題で、College Boardの公式資料ではありません。SATはCollege Boardの商標です。