Isaw her open the window and to someone 1. waved 2.wave 3. waving

i saw her open the window and wave to someone - я видел, как она открыла окно и кому-то рукой.

my friend works at factory because he's a metallurgist. another friend is an advising seller of electronic equipment and clerical aids, therefore he works at office. his home is quite close to the office.

1.can

2.could

3.will be able

4.can

5.can(сомневаюсь,не вижу перехода времени)

6.can

7.can