voice change (as part of puberty)

puberty

a natural phenomenon

time; period / to expect; to look forward to

happen / occur

part, portion / copy of a newspaper or book

hypothetical and imperative forms of こう (kō) [godan] / imperfective and stem (or continuative) forms of こえる (koeru) [ichidan]

a phenomenon

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