1перепишите 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.
2-Present Perfect Passive
3-Present Simple Passive
4-Future Simple Passive