Hard to work out!

Hi guys,

I have always been struggling on this question! At night, I have been trying to work it out but I just can't! Here is the question!
The fox, the chicken and then corn are all on one side. They all have to get to the other side but if the fox and the chicken go over at the same time, the fox will eat the chicken and if the fox goes over with the corn, the fox will eat the corn. If the chicken goes over with the corn, the chicken will eat the corn.

I forgot to mention that they all have to go over safely to the farm. How do you do it?