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1
2 they have known him for many years.
3 The children have been watching cartoons for 2 hours.
4 We haven't had a holiday for 5 years.
5 She has been teaching at this school for twenty years.
6 Mary and Sue have been collecting stamps for four hours.

2
I have been reading Tolstoy stories in the park for two hours.
I have read three stories.
Granny has been knitting in the living room since morning.
Helen has been traveling round Europe for 3 week.
She has already visited 3 countries.