Question 13) D
Question 14) D
Question 15) D
Question 16) B
Question 19) C
Answer:
Both. Depends on the situation.
Explanation:
"Ti" would be you as the object. Mainly after prepositions, "ti" is always used (por ti, para ti, a ti, etc.). "Te" is also for a direct/indirect object and is used when there's no preposition.
Answer:
Here's an example:
Marta y María <em><u>están preparando</u></em> la cena en la cocina.
Explanation: