"We sometimes drink orange juice."
Translation:Biz bazen portakal suyu içeriz.
In Turkish, you can form a noun compound by leaving the first noun in the nominative case, and putting a possessive ending on the second one. "Orange juice" works like that: "portakal" doesn't get an ending, and "su" becomes "suyu." (There's a little more about noun compounds in this post: https://www.duolingo.com/comment/8616301 )