understanding, comprehension / appreciation

not hard to, easy to, is obvious that

understand, comprehend / appreciate

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

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

difficult or hard to do

difficult or hard to do (emphasis on the disagreeability of performing the action)

difficult

negative form of 難い / (literary) easy to