I need help writing constructive and rebuttal debate speeches?

[Ijustwantbackinyourhead]

I need help writing a rebuttal and constructive debate speech. I am on the negative side. The topic is that our school should offer more than spanish as a foreign language. I wanted to be on the affirmative side but i'm stuck on the negative side and don't know what to talk about. What can I say is negative about that?