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. Expanding and improving mail service continues to be extremely essential for population, offices, factories and other organizations.

2. Postal service involves the following operations: reception of mail from senders, transportation and delivery of mail.

3. These waves are suitable for covering distances up to several thousand miles at night but only several hundreds in the day-time.

4. The files are being transmitted but they are not arriving in the same form