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何人かの生徒が

some students

→ 何人
phrase Rare #37,493
some students 何人か means “several” or “some,” and が marks the phrase as the subject. The phrase usually continues with a verb or description.
JA: 何人かの生徒が図書館で勉強しています。
EN: Some students are studying in the library.

教室には何人かの生徒がいました。

There were several students in the classroom.

私は何人かの生徒が宿題のことで文句を言うのを聞いた。

I heard some students complaining about their homework.

校庭に何人かの生徒がいます。

There are several students in the schoolyard.

私たちは何人かの生徒が来るだろうと思っていたが、教室にはだれ一人いなかった。

We thought some students would come, but there wasn't a single person in the classroom.