1. a) Steve hasn't changed a bit. b) Steve has changed a lot. 2. a) Steve never suffers from anything. b) Steve suffers from all illnesses imaginable. 3. a) Steve's legs hurt a lot. b) Steve's legs hardly ever hurt. 4. a) Steve takes a lot of exercise. b) Steve doesn't go in for sports regularly. 5. a) Steve keeps to a diet. b) Steve doesn't keep to a diet. 6. a) Steve drives a car. b) Steve rides a bike.