that means shopping in the paper goods store like ups or kinkos
"What do you buy in the stationary?" Note that "Stationary" is a store where you buy school materials; Such as... Pencils, Pens, Rules, Folders/Binders.. ECT.
It means, "...that looks in the paperwork..." As a question, it means, "What do you/does he/she see in the paperwork?"
This means "You/she/he buy(s) a skirt in a stationery store" when taken literally.
Hace compras en la red durante la clase de computación.It could be also acceptable if you say:Se dedica a hacer compras en la red durante la clase de computación.
It means, "...that looks in the paperwork..." As a question, it means, "What do you/does he/she see in the paperwork?"
"en" means "in" or "on"
It means, "In which store do you make the majority of purchases for food?"
en el = in/on the
'en un' = 'in a'
You would answer by saying what you are buying in the school supply store.
in
"Hablas en español" means "Do you speak in Spanish?" in English.