Определить видовременные формы глаголов, пожалуйста!!!!!
1 modern electric and diesel locomotives work at higher speed
2 In the future the railway will raise the speed and weight of trains and the carrying capacity of the lines.
3 our scientists are solving this complex problem now.
4 Some years ago he railroad was the best means of transportaion
5 the laboratory assistant was fixing a new compter from 5 till 7 yesterday