Task 3 Измените предложения в активном залоге на пассивный залог, обращая внимание на грамматическое время глагола. Используйте предлог by.

Решение:

1. A letter was sent by the headmaster.
2. The Christmas party will be organized by our children next Friday.
3. The dogs are trained by Mary in the garden.
4. All the windows have been cleaned by Mrs. Simpson today.
5. The suitcase has been packed by Frank.