Both are in fact true. The real way of saying it is to scratch an itch, but you can also say that you itch a scratch.
Basically, you do something for me, I'll do something for you.
A Scratch Is: A scratch is a mark on your body that could be coused by hiting somthing, or taking your finger nail and rub it hardly aganst your skin. As a verb: When you itch, you feel something...
Scratch is the interpreted dynamic visual programming language based on and implemented in Squeak
no