Hi,
Do you sit in the back row at the movies
or At the back at the movies
or On the back row at the movies
Thanks
I say 'sit on the back row'.
I am sitting in the back row.
I usually sit in the back row.
I sit upon a chair, within the back row.
Your final sentence is very unnatural. Not only do we normally say "I sit on a chair" (not "upon"), I can't imagine any situation where I would say "within the back row".
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