Yours is also correct, absolutely! I hope you reported it so that the "correct answers" databank is increased.
Agreed. Though like everything in language it is contextual. How you say something is as important as what you say.
llibllens, Who? Oh, yeah -- adolescentes que tienen dieciséis a diecinueve años. ;-)
It's very hard to discern the difference between "ellos" and "ellas" in the recorded voice. In general, for whatever reason, I find the male speaker on Duolingo easier to understand than the female speaker.
With you, Gene415645. The female voice is really awful. I dislike her speaking at all times.
Duo says "they know all OF the answers" is incorrect. Why? I am not a native speaker of English either... am I missing something?
"All of the answers" is good as well. But if you want to say "all of the [something]", you can also leave the "of" out. It's optional.
That sounds like you might not understand what to do in a task. Note that if you have a listening task, you have to write down the Spanish sentence that is spoken, but Duolingo will show you the English translation upon checking.
Good grief, Duolingo. Clean up the pronunciation of these speakers! I can speak quickly and slur words in my native language as well. That is not conducive to learning, however. There are loads of complaints about the lousy slurring, soft "s" and unintelligible speaking voices. Can't you do something to improve this? Good grief.
Please note this this here is a user forum. The Duolingo staff doesn't read these comments. If you want to see an improvement, please use the report function or file a bug report.