I really enjoy duolingo, it's the best app i have had to learn Spanish but does anyone know of another app that is more about writing sentences, translating longer bits of text as a way to improve further? I find duolingo is amazing for getting you started and giving you building blocks but it doesn't have exercises like you would find in a text book........
You could try the real world articles. Its voting based and not immediately right/wrong. But it does allow for more flexibility in how you word your answers.
Try the Immersion feature at the top of the page in the blue portion.
You can find the Immersion Navigation Guide which will teach you how to navigate the Immersion feature here: http://duolingo.wikia.com/wiki/Duolingo_Wiki#Getting_Help The Immersion Community Guidelines are also just inside of that link. Those guidelines will help you learn the finer points of translating as well as proper etiquette as you work with a team of other users to translate entire documents.
Good luck! ^_^
I tend to just use the app even though i realise you have more on the actual website. The app is definitely working for me just this is my first time learning a language on my own without being in school so im stumped for ideas a lot of the time. :-)