Reverse cross

 The reverse cross is basically when your on the wing with the ball and the opponents defender is blocking your space to give a normal cross into the box. This would happen when he is in front of you or there are more defenders behind him making it almost impossible for the ball to reach your teammate. 

In this situation, cut the ball back and bring it to the back foot, this way you have created space by taking the ball to where the defender isn't and now you can deliver a cross into the box but from the opposite leg. Delivering the ball form here can go in because even a small touch from anyone can put it in, because the ball is already on it's way to goal, there's only a small touch needed. 

That's it