Answer:
estas
aquelles gatos
Step-by-step explanation:
estas:
banderas (flags) is plural bandera is the singular form
esta is singular and estas is plural
the adjective should always complement the subject
aquelles gatos:
to make a word plural add +es (as) or +s
(when to use +es(as)) only use + es for words that end in a consonant also double the consonant.
aquel is feminine so it becomes aquellas
(when to use +s) only use +s for words that end in a vowel
gato becomes gatos