1.Antonyms using-un as prefix.
Anti meaning: against/opposed to
Auto meaning: self
Dis meaning: reverse or remove
Il-, Im-, In-, Ir meaning: not
Pre meaning: before
Re meaning: again
Sub meaning: under or below
Un meaning: remove, reverse, not
Prefix meaning: a word add front of the word e.g un+healthy=unhealthy
Suffixes meaning: a word add behind the words e.g care+ful=careful
2.Changing direct speech to indirect speech.