Exercise 125. Turn the following into the Past Perfect Continuous. Add other words indicating a past moment as in the model.
Model: I have been waiting for you for half an hour. — I had been waiting for you for half an hour when you came.
1. I have been packing my things for an hour and a half.
2. He has been working in the laboratory for two years.
3. They have been quarrelling for a long time. 4. The children have been skating for an hour. 5. He has been wearing this suit for a year. 6. My brother has been serving in the army for two years. 7.1 have been washing the dishes for a quarter of an hour. 8. The detective has been investigating this case for a month. 9. The boys have been watching television for three hours. 10. We have been discussing this incident for a week.