III. Подчеркните в каждом из следующих предложений модальный глагол или его эквивалент. Переведите предложения на русский язык.

1. A computer can solve complicated problems many times faster than a mathematician.
2. Programmers must write application programs in a way that computers can understand.
3. One should be careful when switching on this system.
4. Computer-controlled robots are able to improve the quality of manufactured products and to increase the productivity of industry.