EX4. 1. Fast food is very harmful for your health
2. If you want to be healthy you should follow healthy lifestyle
3. Junk food shuold be banned at school
4. Limit your TV and computer time
5. Obesity is a bad habit
6. You shouldn't skip breakfast it is bad for your health
7. I will never smoke. I don't want to have unhealthy skin and teeth
8. Carbohydrates give you 70% of energy

EX5. 1. I have been dieting for the past few years. I have tried all sorts of diets
2. I have been taking dancing lessons since last year. I have learnt three dances
3. I have been studying English since I was 7. Now I  can speak fluently
4. - Oh, you look great! Yes, I have been riding my bike for a month
5. I have been dieting for half a year. Now I look great