Поставьте глаголы, данные в скобках present perfect continuous.
1) My grandfather (to work) in the garden since he retired.
2)I (to use) this cream since I discovered it.
3)she (to sell) fruit and vegetables for five years.
4) the factory (to produce) these trainers for two years.
5) my mum( to eat) low-calorie foods for six months.
Помогите пожалуйста.