Make the following sentences passive.
1. Jilles de Dion built the first mechanically propelled vehicle.
2. They have already sent the letters.
3. They were asking him questions for 2 hours.
4. The factory workers will appreciate improved conditions of work.
5. The mechanic is repairing Bill’s car?
6. An architect didn’t design this house.
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1) the first mechanically propelled vehicle was built by Gilles de Dion.2) the letters have been already sent by them.
3) He was being asked questions for 2 hours by them.
4)Improved conditions of work will be appreciated by the factory workers.
5) Bill's car is being repaired by the mechanic
6)This house was't designed by an architect.