I. Определите функцию слов, заканчивающихся на —ing:
а) Participle I в функции определения;
б) Participle I в функции обстоятельства;
в) Participle I в составе временной группы Continuous;
г) герундий.

1. The network of post-offices rendering direct service to population is growing year after year.
2. Nowadays central offices are connected to long-distance offices by connecting trunks; long - distance offices are in turn interconnected by intercity trunks.
3. The voltage applied to the input of a radio frequency amplifier varies from units to hundreds of microvolts, depending on the selectivity of the receiver.
4. This method of locating objects by using radio techniques has found a wide range of applications.

1. rendering -Participle I в функции определения; growing -   Participle I в составе временной группы Continuous;2.  connecting -герундий. 3.  depending -Participle I в функции обстоятельства;4.   locating, using - gerund