Matching Pairs Zero conditionalOnline version The zero conditional usage by Sandra Dias 1 If you touch the motorcycle, 2 Fish die if 3 If you heat water, 4 If you want to come, 5 If you heat water to 100 degrees Celsius, 6 Does ice melt 7 If you press the button, 8 If you prefer, 9 If you don't pay attention, 10 My boss gets angry, the machine starts to work. I can take a cab. call me before 5:00 p.m. the alarm goes off. they stay out of water. if I am late for work. it evaporates. if you heat it? you cut yourself with a knife. it boils.