Why is it "i libri" instead of "il libri?"
The articles are inflected too: the plural of "il" is "i", and the plural of "lo" is "gli".
Grazie! good to know!
the books=i libri, the book=il libro
In the audio example, they didn't use "i".
why 'loro' and not 'sono'?
Loro means "They".
Sono means "am" or (they) "are".
If duolingo says loro leggono libri it is good but when they give me the same english sentence and i write it as duolingo its wrong and they ask me for an article... i dont understant really
They read = leggono
the books = i libri
They read the books = Leggono i libri
Then it's possible to add "Loro" in the beginning for emphasis, ~ THEY read the books.
When you feel ready there is a lot more to learn about the Italian definite articles at ThoughCo
My answer was right