教室を掃除

clean the classroom

→ 教室
phrase Rare #36,676
clean the classroom 教室を掃除 is the noun 教室 (classroom) marked by を plus 掃除する (to clean). The verb is often conjugated, as in 教室を掃除する (clean the classroom) or 教室を掃除しなければならない (must clean the classroom).
JA: 毎週金曜日に教室を掃除します。
EN: We clean the classroom every Friday.

先生は私たちに毎日教室を掃除するように言う

The teacher tells us to clean the classroom every day.

先生は教室を掃除するように命じた

The teacher ordered us to clean the classroom.

生徒達放課後自分たちの教室を掃除しているのを見て私はとても驚きました

I was very surprised to see the students cleaning their own classroom after school.

私たちは教室を掃除しなければならない

We have to clean the classroom.