1. Перепишите и переведите предложения, обращая внимание на употребление времён группы Continuous (Present, Past, Future) и группы Perfect (Present, Past, Future). Выпишите сказуемые и укажите их видовременные формы. a. The traction motors were pulling the train up a very steep grade, when suddenly they stopped working.
b. Another form of dynamic braking has recently been developed in our new laboratory.
c. The traction motors have turned into generators; now they are returning the electrical power back into the grid.
d. Look! The locomotive isn’t being propelled by the diesel engine!
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