1) if ) this button the ) 2) if (not practike) the piano every evening ) how to play it. 3) if ) ice ) 4) if/when (not eat) ) hungry. 5) when (fly) budget airline (have to) pay for your drinks and snacks

1) if you press this button the machine will stop.
2) if i don't practice the piano every evening, I will forget how to play it.
3) if you heat ice it will melt.
4) if/ when people don't eat they will get hungry.
5) When you fly budget airline you will have to pay for your drinks and snacks