People will get fat, if they eat junk food. People would get fat, if they ate junk food.If a person practises sports, he or she will always feel good. If a person practised sports, he or she would always feel good. She will pass the test if she studies hard.She would pass the test if she studied hardIf dogs have wings, they are will be able to fly If dogs had wings, they are would be able to flyIf I am you, I shall drive more carefully in the rainIf I were you, I should drive more carefully in the rainPaula will be sad if Jan leavePaula would be sad if Jan left