Future with ir- (e.g.: vou falar)

Questions about the Future with ir

Q: Why is it Vai começar amanhã and NOT Vai começa amanhã?
The verb ir is followed by the infinitive, not a conjugated verb. So you must use começar, not começa.

Q: Why is it Eu vou fazê-lo and NOT Eu vai fazê-lo?
Remember, the eu form of ir is vou, not vai.

Q: Why is it Vou comer and NOT Vou come?
The verb ir is followed by the infinitive, not a conjugated form. Always use comer, not come.