Need help with corrections :( 18. ¿Mandas una tarjeta a tu amigo? Sí, la mando para él.
teachers message: a tu amigo is the indirect object we are trying to replace. We can replace that whole phrase with one word (me, te, le, nos or les). Which one do we use? Where does it go in the sentence? Does it need to become Se?

19. ¿Haces la tarea para tu profesora? Sí, la hago para ella.
teachers message: para tu profesora is the IO, which IOP do we use? Where does it go? Does it need to become se?