Определите в каждом из них видовременную форму и залог глагола-сказуемого. 2 this airplane crosses the atlantic in about 10 hours. 3 when our teacher came to the laboratory, we were carrying out an experiment with a new device. 4 the delegation is headed by the prime minister.
3 came -Past Simple Acrive ;were carrying -Past Continuous Active
4 is headed -Present Simple Passive