1.情态：The room must be cleaned right now.这房间必须马上打扫.
2.现在进行时：The room is being cleaned.这房间正在打扫中.
3.现在完成时态：The room has been cleaned.这房间已经打扫过了.
4.一般现在时：The room is cleaned everyday.这房间天天打扫.
5.一般过去时：The room was cleaned just now.房间刚刚打扫过.
6.将来时：The room will be cleaned tomorrow.房间明天打扫.