1. The bridge, which (is being built – Present Continuous Passive) now, (will be used – Future Indefinite Passive) for the movement of both road and railway traffic.
2. The movement of trains (was stopped- Past Indefinite Passive) on that section of the line because the workers (were replacing – Past Continuous Active) the sleepers.
3. Nowadays crossties (are made – Present Indefinite Passive) of wood, concrete, steel and cast-iron.