staggered shelves (two shelves at different heights, each one extending from one wall while not touching the other wall, but mutually joined in the middle with a vertical segment)

without a doubt; for sure

certainly; without a doubt

(collective) brothers / (collective, by extension) siblings / (collective, by extension) brothers and sisters; brethren (brotherhood; fellowship)

inappropriate; out of place

inappropriateness; being out of place

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

(chiefly women's speech) first person singular pronoun: I, me