Определите формы и функции герундия:1 Computers are widely used for controlling

Обусловьте формы и функции герундия:
1 Computers are widely used for controlling all kinds of processes.
2 Driving a truck in the city is difficult.
3 One of the best ways of keeping the speed steady is using a computer for this purpose.
4 It is difficult to solve some of the present-day scientific and technological problems without using supercomputers.
5 The strange man stopped following me.