All Spanish verbs finish in -AR, -ER or -IR.
With regular verbs, you remove the final -AR, -ER, or -IR and add the correct ending for whichever person is doing the action of the verb. AR endings:
-o: (Yo)
Hablo (I speak)
To Speak = Hablar. I Speak = Yo hablo
YO (a) MUCHO EN LA CLASE.