He walk into the room,and turn the light on.
ls的都有问题嘛~~应该是Please knock at the door before you enter the room
He went into the room and turned on the light.
Please knock before you come in the room/house看你说的是房间还是房子
He walked into the room and turned on the light.He went into the room and turned on the light.
Please knock on the door before you come in.
Please knock before you enter
knock before entering进屋请先前敲门 ---will
knock the door before you entre in,please
Come in，please！请进！
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