Answers:

1. What's Mr Lewis' problem?   He's got an earache
2. How often does Mr Lewis swim?  He swims every morning
3. What does the doctor prescribe?  Eardrops and some pills
4. What advice is Mr Lewis given? 

•      Take the pills every day for a week
•      Use drops every morning
•      Don't swim for a week

1. What's Dr Norton's problem?  he's got backache
2. Why can Mr Lewis help Dr Norton? Because his father has a bad back