Answers:
Question 1: El regalo grande es (for him)
Answer 1: El regalo grande es para él.
Translation 1: The big gift is for him.
Question 2: Mañana salgo (without you, pl. form.)
Answer 2: Mañana salgo sin ustedes.
Translation 2: Tomorrow, I leave without you.
Question 3: Hay un mensaje (for you, sing. fam.)
Answer 3: Hay un mensaje para ti.
Translation 3: There is a message for you.
Question 4: Esos pantalones son muy feos (for me)
Answer 4: Esos pantalones son muy feos para mí.
Translation 4: Those trousers are too ugly for me.
Question 5: Traigo este libro (for you, sing. form.)
Answer 5: Traigo este libro para usted.
Translation 5: I bring this book for you.
Question 6: No me gusta estar (without them, f.)
Answer 6: No me gusta estar sin ellos.
Translation 6: I do not like to be without them.
Question 7: ¿Te interesa venir a la playa? (with me)
Answer 7: ¿Te interesa venir a la playa conmigo?
Translation 7: Are you interested in coming to the beach with me?
Question 8: Ellos no pueden celebrar (without us, f.)
Answer 8: Ellos no pueden celebrar sin nosotros.
Translation 8: They can not celebrate without us.