次の水泳の授業を受講する予定のクラスの男の子たちが更衣室に入ってきた。

次の水泳の授業を受講する予定のクラスの男の子たちが更衣室に入ってきた。

Results (English) 1:

Boys in the class who are planning to take the next swimming class have entered the changing room.

Results (English) 2:

Boys from the class who are going to take the next swimming class came into the changing room.

Results (English) 3:

The boys in class who are going to take the next swimming class came into the dressing room.