Задание 4. Make this sentence passive. The architect calculates an estimate of the design of the building.
Задание 5. Open the brackets.
1. Scientists so far (to find) only 115 different kinds of atoms.
2. A battery (to produce) electricity using two different metals in a chemical solution.
3. To solve the problem of sending electricity over long distances, William Stanley (to develop) a device
called a transformer.
4. Half of the electrons (to spin) in one direction; half (to spin) in the other.
5. The concept of electric field (to be introduced) by Michael Faraday.

1. The secretary had prepared the documents for signing the contract by 12 o'clock.

Секретарь подготовил документы для подписания контракта к 12 часам.

Had prepared — Active voice, Past Perfect

2. Don't be late. The Director General will be waiting for the delegation at 9 o'clock.

Не опаздывайте. Генеральный директор будет ждать делегацию в 9 часов.

Will be waiting — Active voice, Future Continuous

3. When I entered the office the sales manager was dictating a latter to his assistant.

Когда я вступил в должность менеджера по продажам стал последним диктатором для своего ассистента.

entered — Active Voice, Present Continuous

4. Have you sent any enquiries to foreign firms this month?

Вы отправили запросы иностранным фирмам в этом месяце?

sent — Active voice, Present Indefinite

5. He has given a job of considerable responsibility.

Он дал значительно ответственную работу.

Has given Passive Voice, Present Perfect