1) 1. They clean the classroom everyday. 2) 2. They cleaned the classroom yesterday. 3) 4. They are cleaning the classroom now. 4) 3. They will clean the classroom tomorrow. 5) 5. They were cleaning the classroom then. 6) 6. They have cleaned the classroom. 7) 7. They have cleaned the classroom. 8) 8. They had cleaned the classroom. 9) 9. They must clean the classroom after class.

U4-被动语态

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