to do someone’s job temporarily
誰かの仕事を一時的にする (dareka no shigoto o ichijiteki ni suru)
"I had to fill in for my colleague while he was on leave."
"同僚が休暇中に代わりにしなければなりませんでした。" (Dōryō ga kyūka-chū ni **fill in for** shinakereba narimasen deshita.)
to talk about something that has been worrying you
to think of or produce an idea or solution
to continue following positive routines or behaviors
to take an exam
to gather and prepare belongings before a trip
to continue talking for a long time, often unnecessarily