"Eu vărs lipiciul pe o foaie de hârtie."

Translation: I spill the glue on a sheet of paper.

[olb38]

Why we need "o" here? ...pe o foaie de hartie. As usual there is no need - pe masa, pe carte etc.

[pablopublico]

Why "foaie de hârtie" and not "foaie hârtii"? Mulțumesc mult.

[abcdefg-1]

Because "foaie hârtii" translates as "sheet papers" which makes no sense.

"foaie" = "sheet" | "de" = "of" | "hârtie" = "paper"

[Chris265302]

I think "Onto a sheet of paper" is probably better English for this example. Thanks.