All of your essays in which you argue a point should start out like that. Say what you believe and go on to support it.
I think that requiring uniforms in school is a pointless and costly decision that should be overturned.
I think that developing nations should not be exempted from conforming to global warming standards.
Whatever... as long as you support it with (usually) three good points. If you don't have a third point, you can argue about why a point made by someone arguing the other side of the issue is wrong.