1. If Dan has a problem, he always speaks to his parents. 2. If my neck hurts tomorrow, I will go to the doctor. 3. Your defences will be very low if you get the flu often. 4. Sarah will not be happy if she misses the next train. 5. If Tom and Jack do not switch off their mobile phones now, I will get angry. 6. If musicians do not practise every day, they will not be serious about their profession.