If you heat water, it boils.

If ice melts, it turns to 
water.

If a cat crosses your 
path, it brings good luck.

If you throw a stone into 
water, it sinks.

If I'm late for school, my 
teacher is angry.

The cat runs away if we 
leave the door open.

The machine switches 
off if you press this 
button.

If you do a lot of 
exercise, you get fit.

You get fat if you eat too 
much.

If you think too much, 
you get depressed.