7週3日目 学生は勉強するものだ
Regardless・list・opportunity
接続：普通形＋ものだ
inherently, common sense; recall; exclamation
注意 / Note：THREE meanings, look at the divided form and separate. 動辞書形＋ものだ is common sense (子どもは遊ぶものだ). 動た形＋ものだ is to reminisce (よく徹夜したものだ). イ形／ナ形＋ものだ is an exclamation (早いものだ).
比較 / Compare：Same article: 〜ものではない／〜というものだ. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form：普通形＋ものだ。Means to reminisce or go with 昔・若い頃・よく. Exclamatory meaning often goes with 本当に.
子どもは元気に遊ぶものだ。
Children should play actively.
若い頃はよく徹夜したものだ。
When I was young, I often stayed up all night.
月日がたつのは早いものだ。
The years go by really quickly.
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