understanding, comprehension / appreciation

(physically) true, straight, unwarped, unskewed, proper / (abstractly) correct, right, true

(uncommon, dialect) factual, true, correct, accurate / (uncommon, dialect) genuine, real / (uncommon, dialect) actual, real, certain

action; behavior

to act

prerequisite

assumption

assumption / hypothesis / supposition

understand, comprehend / appreciate

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