"You read me the newspaper."
Translation:Siz bana gazeteyi okursunuz.
Duo accepts both for this sentence. They just have to pick one at random to be the "default" answer on the discussion page. A few things to keep in mind:
1) If we include the subject pronoun, the personal suffix on the verb must match:
Sizbana gazeteyi okur
Senbana gazeteyi okur
2) Make sure you're using the correct tense of the verb. Duo does NOT accept "okuyorsun" or "okuryorsunuz" for this sentence.
3) "Siz" can also be singular if we are speaking formally (to a stranger, teacher, employer, elder, etc.)
The only time Duo will be picky with "sen" vs "siz" is when there is something else in the sentence to indicate that we are speaking formally/informally or in plural. Hope that helps :-)