Need help plz help me

If you wanted to say something in spanish, what would you say?

My spanish teacher said this to me.. look at the ending on your verb. you need to make it agree with "yo" this is my sentence- sí yo estudiar español en la escuela how do i make it agree with "yo"

Can you me conjugate this sentence of doubt using the subjunctive mood? “mis padres dudan que yo (hacer) toda mi tarea cada noche.”