Answer:
3.Mi novio me compra muchos regalos. Siempre los compra cuando vamos de vacaciones.
4.Tus amigos te explican la gramática. La explican después de clase.
5.Marta les dio una cámara nueva a sus padres. Se los dio en su aniversario
Step-by-step explanation:
I am native spanish speaker so here is my explanation:
3. "los" is the pronoun I added to the sentence since it makes reference to the gifts or "muchos regalos"
4. "La" is the pronoun I added to the sentence to make reference to the noun grammar, in spanish "gramática"
5. "Se los dio" means that she bought the camera and give it to them