Нужна помощь по английскому! Перифразируйте предложения, используя Passive Voice, указывая при возможности исполнителя

Перифразируйте предложения, используя Passive Voice, указывая при возможности исполнителя действия.
1. You can't wash this dress; you must dry-clean it.-This dress can't be washed--it must be dry-cleaned. 2. They waste a lot of time discussing unimportant things.-A lot of time is wasted discussing unimportant things. 3. They have typed my letters.- My letters have been typed by them. They will type yours in a minute-.Yours will be typed in a minute. 4. They are repairing my piano at the moment. -My piano is being repaired by them at the moment. 5. The guests ate all the sandwiches and drank all the lemonade. They left nothing.All the sandwiches were eaten and all the lemonade was drunk by the guests. Nothing was left. 6. Has someone posted my letter?-Has my letter been posted by anyone?/someone 7. Why has no one informed me of the change of the plan?-Why haven't I been informed of the change of the plan? 8. I'm afraid we have sold all our copies but we have ordered more.-All our copies have been sold and more have been ordered. 9. They have not stamped the letter. -The letter hasn't been stamped by them.10. She didn't introduce me to her mother.- I wasn't introduced to her mother.11. An earthquake destroyed the town.-The town was destroyed by the earthquake. 12. A machine could do this more easily.-This could be easily done by a machine. 13. Visitors must leave umbrellas and sticks in the cloak-room.-Umbrellas and sticks must be left in the cloak-room.

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