Hi Vincent, We normally use the word 'duty' when we are describing someone's job rather than when we are talking about them actually doing it. 'Duties' are often referred to as 'jobs'. eg Her duties/jobs include washing the floor and dusting the shelves eg She is washing the floor and dusting the shelves.
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Dr Nick Riviera((b) She is on duty; cleaning/to clean the classroom.
I think this classroom must be a very clean one! Everyone is cleaning it!
She is on duty; cleaning the classroom.
She is on duty; to