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3/
1. Tom's father told him if he went to bed on an empty stomach, he wouldn't be able to sleep well.
2. My mother warned me that if I worked too much and didn't rest, I would weaken my immune system.
3. Ann's doctor told her that if she followed his advice, her health would be much better.
4. My grandmother explained that if children didn't get enough calcium, they wouldn't grow strong and healthy bones.
5. Alice said that if she consumed a lot of fast food, she could become overweight.
4/
1. Quan's father reminded him not to take his medicine regularly.
2. Peter's doctor suggested he should have a health check-up every six months.
3. Jim's friend advised me to eat less fast food and more vegetables.
4. Alice's yoga instructor insisted Alice on practising those relaxation techniques every day to improve her health.
5. Kevin's doctor warned him not to go out if air pollution levels were very high.
6. John apologised to his doctor for not following his instructions.
