Задание 1
Перепишите следующие предложения, определите в каждом из них видо-временную форму и залог глагола-сказуемого
1. Helicopters were first introduced for regular airline service in 1947.
2. The experiment has been carried out successfully.
3. The pipe- lines are used to transport petroleum.
4. The new equipment will be tested on Monday.