Для того чтобы раскрыть скобки, употребляя глаголы в Passive Voice (страдательном залоге), необходимо определить время каждого предложения и использовать соответствующую форму глагола "to be" плюс причастие прошедшего времени (Past Participle) основного глагола.
Two reports were made in our group last month.
- Время: Past Simple. Используем "were" + "made".
Her letter was received yesterday.
- Время: Past Simple. Используем "was" + "received".
New engineers have just been introduced to the head of the department.
- Время: Present Perfect. Используем "have been" + "introduced".
The children will be taken to the theatre by the teacher. Everything will be all right.
- Время: Future Simple. Используем "will be" + "taken".
I am sure I will be asked at the lesson tomorrow.
- Время: Future Simple. Используем "will be" + "asked".
The new student is always spoken of.
- Время: Present Simple. Используем "is" + "spoken".
The hostess said that one more guest was expected.
- Время: Past Simple. Используем "was" + "expected".
This new dictionary is sold everywhere now.
- Время: Present Simple. Используем "is" + "sold".
The letter will be posted tomorrow.
- Время: Future Simple. Используем "will be" + "posted".
The article is being discussed now.
- Время: Present Continuous. Используем "is being" + "discussed".
Yesterday we were sent the contract.
- Время: Past Simple. Используем "were" + "sent".
The telegram will be received tomorrow.
- Время: Future Simple. Используем "will be" + "received".
Moscow University was founded by Lomonosov.
- Время: Past Simple. Используем "was" + "founded".
The young man was introduced to me two minutes ago.
- Время: Past Simple. Используем "was" + "introduced".
Zhukovski is called the father of Russian aviation.
- Время: Present Simple. Используем "is" + "called".
Каждое предложение в страдательном залоге показывает, что действие выполняется над подлежащим, а не самим подлежащим.