work in 通常是指工作於某個行業或領域
I work in education field. 我從事教育
work for為...工作; 為...做事
I have worked for Cindy for seven years.
He's working at controlling his temper.
You'll never learn Spanish if you don't work at it.
work at 地方 在某地方工作 從事於
I work at a restaurant.
Work out（運動 / 解決問題）
You can work out the problem by yourself.
I work out regularly to keep fit. 我經常努力鍛鍊身體以保持健康。
Work _____ in （把…安排進去）
to manage to do something or see someone in a short period of time or when you are very busy
squeeze sb/sth in
I'm very busy this week but I could squeeze you in at 2.30 on Tuesday.
Today we are busy, but we can work you in.