Harp,violin,viola,cello y double bass
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.
I think this means "irregular endings"
The 3rd option
Mi hermano (My brother)
