St1: Nam is putting on weight.
St2: To avoid obesity, He should eat more fruit/ vegetables./do more exercise, and eat less junk food. *Eg2: 1. St1: Nga is having a toothache.
St2: To avoid (having a) toothache, she should eat less junk food./ She shouldn’t eat too much candy.
2. St1: I am having sunburn.
St2: To avoid sunburn, you should wear a sunhat when you go out and sunbathe less.
( đưa ra tình huống + lời khuyên hợp lí)