ХЕЛП МИ ПЛИЗ МАЙ ФРЕНДЗ. ниче не понимаю, но надо сделать

1.My grandfather works in the garden since he retired

2.I use this cream since i discovered it

3.She sells fruits and vegetables for five years

4.the factory produce these trainers for two years

5.My mum eats low calorie-food for six months

6.My sister does aerobics since last year

7.i don't eat fried meat since i began to follow a diet

8. Mary uses this toothpaste for a long time

9. his grandfather didn't smoke since he visited his heart doctor

10. She didn't drink strong tea for many years