If you eat too much you will feel ill.
If you don't save some money you will not go on a holiday.
If you want to go camping you will need a tent.
If you see your sister, will you tell her about the concert?
If you telephone me when your train arrives, I will collect you from the station.
If you cycle too fast you will have an accident.
If you forget your homework again, you will be in trouble.
If you go out in the snow you will get cold.
If you don't eat breakfast you will not have enough energy in the morning.