Need help with 2 corrections please! My teacher is giving me a hard time, I attached my answer, along with the teachers message, thanks :)
Answer the following questions using both a direct and indirect object in your response. Follow the example.
Example: ¿Cocinas la comida para tu familia? Do you cook the food for your family?
Sí, se la cocino. Yes, I cook it for them.

18. ¿Mandas una tarjeta a tu amigo?

my sí, manda (teacher: what is the yo form of this verb?) esto para ellos.

teachers message: una tarjeta is a direct object. and a tu amigo is the indirect object. What are their pronouns? Where do they go?

19. ¿Haces la tarea para tu profesora?

my Sí, lo hago por ellos.

teachers message: la tarea is the direct object. and para tu profesora is the indirect object. What are their pronouns? Where do they belong?
please help :(

18. ¿Mandas una tarjeta a tu amigo?

(Do you send a card to your friend?)

In the English sentence above, "a card" is the direct object, since it has no prepositions. However, "to your friend" is the indirect object, once it has the preposition "to", equivalent to "a" in Spanish.

A possible correct answer could be: "Sí, la mando para él."

"La", as a direct object, retakes the feminine term "tarjeta" - card -, and "él", masculine 3rd person singular pronoun, retakes the term "amigo" - friend -, being placed as indirect object.

19. ¿Haces la tarea para tu profesora?

(Do you do the homework for your teacher?)

In the English sentence above, "the homework" is the direct object, since it has no prepositions. However, "para tu pofesora" is the indirect object, once it has the preposition "for", equivalent to "para" in Spanish.

A possible correct answer could be: "Sí, la hago para ella."

"La", as a direct object, retakes the feminine term "tarea" - homework -, and "ella", feminine 3rd person singular pronoun, retakes the term "profesora" - teacher -, being placed as indirect object.

18. Si, la mando. Yes, I send it to him.

19. Si, la hago. Yes, I do it.

Explanation: