understanding, comprehension / consent, agreement

roger (over radio etc.), OK

understand, comprehend / agree, consent

explanation

to explain

to hear, to listen / to obey / to ask a question / to smell, sniff

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

perfect, completed