Question

¿Tú _________ que mañana tenemos las clases de teatro?

Answer 1

The answer would be "sabes" it means "do you know" conoces mean also "do you know" but it refears if you know someone and sabes is if you know about something, "sabemos" means we know and "conosiste" means did you meet

Hope this helps

Answer 2

Tú sabes que mañana tenemos las clases de teatro