noun, する verb, の adjective
Your "doing actions" are the things you do. What do you say when someone asks "what you do"? You tell them what your job is.
This word uses the on'yomi reading for 仕 and the kun'yomi reading for 事. Please note that 事 uses the reading こと, which you didn't learn with the kanji, but you have come across it once or twice by now, and because of the way rendaku works, it's changed to the voiced ごと.
Does this job reimburse transportation costs?
The business of a baby is to cry.
"Do you think we can finish this work in time?" "Well I wouldn’t bet on it."