Краткое пояснение: Перевод предложений в страдательном залоге означает, что действие направлено на подлежащее.
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The rule is explained by the teacher.
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This house was built in 1990.
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A letter will be written by her tomorrow.
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The problem is being discussed by the students now.
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The project has been finished by him.
Ответ: смотри в решении