Помогите пожалуйста Номер 4 а

1. You should look carefully before you walk across the road. 2. Everyone should eat lots of fruit and vegetables. 3. He shouldn't bo so pessimistic. He should be more positive. 4. She shouldn't eat all that fast food. It isn't healthy. 5. They shouldn't get married now. They're too young. 6. You shouldn't smoke. It's very bad for you.!