I think Duolingo does an okay job of teaching structure, but it probably comes around the 2nd year or so (I've been using it about 3 years, but I did have a few years in high school of Spanish a long time ago)
Yeah. I've been doing Spanish on Duolingo for about 2.5 years, and just started Section 5. I find that I can read Spanish reasonably well, in that I can usually at least work out what the underlying meaning is for any arbitrary piece of Spanish text I see. But my ability drops off quickly for listening to spoken Spanish, and even more quickly for speaking it myself. Which makes sense given how the site works.
