Ответ:

1 Jim  has been working out at the gym since 3 o'clock 2 the cats have been fighting for 20 minutes 3 Julie and Kay have been sending e-mail for 2 hours 4 - Tom has been practising the violin since this afternoon

Объяснение:

Ответ:

1. Jim has been working out since three o'clock.

2. The cats have been fighting for twenty minutes.

3. Julie and Kay have been sending e-mail for two hours.

4. Tom has been practising violin since the afternoon.

Объяснение: