big, large, great

lesson, teaching

to teach

failure, miscarriage / mistake, fault, error

fail / make a mistake

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

cannot

get, acquire, gain, obtain, win, catch / be able to, can / (in the form ざるを得ない following the imperfective form of a verb) cannot help but doing, cannot but do