I like this girl a lot?

There's is this girl that i like a lot. Shes so pretty and nice to me. Shes in my english cl and when i look at her when shes talking with her freinds and she sees me she smiles at me. When we have to sit next to each other in science she always ask me where i got my answers. Her lockers a few down from mine because she's in my homeroom. We never talk in any of the cles were in. SO my question is what can me and her talk about during the cles i have with her? and theres a spring dance coming up in april or something do you think i should ask her to that?