Объяснение:

1) If you do Tai Chi, you’ll be more relaxed. 2) If you drive

slower, the passengers will feel safer. 3) If you suck a cough sweet,

your sore throat will get better. 4) If you eat too late, you won’t sleep.

5) If you don’t lift heavy items properly, you’ll hurt your back.

6) If you drink milk, your stomachache will go. 7) If you take vitamins,

you’ll have more energy. 8) If you drink eight glasses of water a day,

your skin will be sparkling!

Правило First Conditional:

If + Present Simple, … Future Simple.