"Měsíc svítil mezi mraky."

Translation: The moon was shining between the clouds.

[tatka_]

I don't understand why i must use the article "the" before plural "clouds".

The same like this: https://www.duolingo.com/comment/24697525

[CathyBowde1]

Me too

[DaleMartin1]

Me too

[MaarikaVaa]

I must say that I like this section of Duolingo Czech course very much, you have got here so many beautiful and romantic sentences!

[Charles737578]

"The moon was shining between clouds" is absolutely correct.

[AgnusOinas]

I agree that both options (with and without the article) are correct. Just wondering: Did you use the report button and choose "My answer should be accepted"?

https://books.google.com/ngrams/graph?content=between+clouds%2Cbetween+the+clouds&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1%3B%2Cbetween%20clouds%3B%2Cc0%3B.t1%3B%2Cbetween%20the%20clouds%3B%2Cc0