Interested in Language
Can "discuss" be used in the same way as "talk"?
For example is this sentence acceptable? "I was discussing (talking) with John, while my sister was preparing dinner."
My feeling is that "discussing" should always be followed by an object of the discussion.
You are right. The subject under discussion should be given, or referred to.
I was discussing the latest space probe with John while my sister was preparing dinner. (No comma is required after "John".)
I was discussing that with John just the other day.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.