Yep, both are correct, but i, personally, dont listen to many ppl saying that this way. So i meant maybe thats because duolingo hasnt accepted his answer. Maybe they use the most common, as i see in many exercises. Anymay, in such a situtation, the best thing is to report the problem. Thx for your insight :)
One Summer later.....
It's more common to use the article, even when not specific. There are so few preset and well known named seasons that we automaically see them as special.
That said, it's allowed to avoid the article (only when not specific), but it's still better to use it.
The sentence "I don't like summer" is correct. It is like "Thank God it is Friday" you don't say "Thank God it is the friday"... http://en.wikipedia.org/wiki/Thank_God_It's_Friday
Well..... im afraid so.. or u can feedback on the home page.... doing so u'll help yourself and new learners too, as well as duolingo . Some friends of mine are taking english beta version and they tell me there are many acceptable answers which duolingo doesnt get... unfortunately we'll have to deal with that for some time :( and continuing committing some mistakes. Boring, but everytime we make a mistake, lose all the hearts, we try again and learn more :) good studies...
Oh! After answering a question using the web version of Duolingo a "Report a Problem" button appears and clicking it displays a dialogue with a number of options selected by tickboxes. One of the tickboxes was labelled "My sentence should be accepted". In the past I used that option quite a lot, and even though I submitted other types of feedback, that option was only type ever acknowledged by an email. Does my comment make sense now?