Answer:
Tú
Explanation:
Tú is the only one of those four that is informal.
Tú is informal "you", usted(es) is "formal you (all)".
Ellos is "they".
Answer:concierto
Explanation: cancion means song, cantante means singer and cascada means waterfall
Answer:
millones
Explanation:
(mi-yo-nes) would add an e :D
