Определите видо-временные формы глаголов??There were few railways at the end of

Обусловьте видо-временные формы глаголов??There were few railways at the end of the 19th century in russia. Some years ago we did not know much of computer engineering.Radio makes it easy to communicate with the remotest parts of the country. The railroad engineers are improving the locomotives protective device now. Our industry will be applying still more plastics in the nearest future.