If Laura is hungry, She eats your food

https://www.google.com.mx/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwi0poTX9p7PAhXFbSYKHSK1DucQjRwIBw&url=http://www.slideshare.net/safaakhoungui/conditional-type-3&psig=AFQjCNHuy1hePa2cP_IV4_4_yIjlnNTrHg&ust=1474494265352802

We can use "when" instead of "if".

When it rains, my dad uses a umbrela.

TWO DIFFERENT WAYS OF COSRUCTING SENTENCES WITH CONDITIONAL 0

If I have homework to do, I don’t take a nap.

I don’t take a nap if I have a homework to do.

When people don’t sleep 8 hours, they are sleepy the rest of the day

People are sleepy the rest of the day, if they don’t sleep 8 hours