activity の複数形ルール (3級頻出)
activitys
activities (y → ies)。同じパターン: hobby → hobbies
city → cities
story → stories。hobby vs activity vs interest の三角関係
hobby=個人的趣味 (狭い、継続的)
activity=活動全般 (広い、1回限りも可)
interest=関心 (心理状態)。
school activities の3種
club activities (部活)
school events (行事)
after-school activities (放課後活動)。
active vs activity
active (形容詞) → activity (名詞)、"He is active" / "His activities are many"。