Here are the example sentences
We use work at followed by a place or a task:
- Jack works at a bank downtown.
- The boss was working at his desk all day.
- I had a problem with my computer and I was working at it for a few hours until it was solved.
We use work for followed by a company, a cause or a person:
- Jack works for NYC Finance downtown.
- Jenny has been working for animal rights all her life.
- Teddy used to work for Jack Welch.
We use work in followed by a field or industry:
- Jack works in finance.
- I’ve been working in international education for more than 20 years.
We use work on followed by a task:
- Jack works on finance reports for the bank.
- I was working on my lessons all morning.
We use work with followed by a body part, a tool or a person:
- Jack works with a computer and a financial calculator.
- I worked with Greg and Nobi in my previous job.
- Freddy is a plumber, so he works with his hands.
By the way, work out is also phrasal verb, which means exercise:
- Danny works out at the health club on 53rd Street.
- I need to start working out, but it is so difficult to get started!
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