Краткое пояснение: Чтобы перевести предложение из активного залога в пассивный, нужно определить подлежащее, сказуемое и дополнение, а затем изменить структуру предложения так, чтобы подлежащее стало дополнением, а дополнение - подлежащим.
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The problem with different environmental organisations has been discussed by the mayor.
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Many rivers have been polluted by factories.
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The grass has been cut by Dad.
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Has the accident been reported by them?
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The car has been washed by the children.
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An alarm system in his house has been installed by Mr. Briggs.
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Has our car been repaired by the mechanic?
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Dinner has been prepared by Mother.
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The project hasn't been completed by us.
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The ancient monuments have been visited by many tourists.
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A talk on alternative sources of energy has been given by the professor.
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The guests have been shown to their rooms by the hotel staff.
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Have many books been written by this author?
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Has the contract been signed by them?
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All his products have been sold by the salesman.
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Eric's birthday has been celebrated by everybody.
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The operation hasn't been performed by Dr. Smith.
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The doctor has been called for by us.
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Have the snacks been prepared by them?
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Lisa hasn't been paid by the company.
Ответ: смотри выше