部屋に入る前に

before entering the room

→ 部屋
phrase Rare #41,753
before entering the room A phrase used to describe an action that should happen before going into a room. 前に means “before,” and に marks the time or condition.
JA: 部屋に入る前に、靴を脱いでください。
EN: Please take off your shoes before entering the room.

私の部屋に入る前にあなたはいつもノックすべきだ

You should always knock before entering my room.

部屋に入る前にドアをノックして下さい

Please knock on the door before entering the room.

彼は上司いる部屋に入る前に深呼吸をした

He took a deep breath before entering the room where his boss was.

部屋に入る前に靴を脱ぎなさい

Take off your shoes before entering the room.