"Czy on używa mózgu?"

Translation: Does he use his brain?

[Pasteten]

Od czasu do czasu

[Lord_Pengwyn]

Nah, you can take it.

[chce_polski]

Not if he is a politician.

[xwintermoonx]

Polish parents when you get a B in school:

[MBooguy]

How would "Use your brain" be translated? "Uważaj mózg"?

[alik1989]

Uważaj means "watch out!". What you want is użyj (perfective) or używaj (imperfective)

[Yola448704]

The sentence "Use your brain!" is a rude expression meaning:
Think!/ Why don't you think! - Myśl!/ Pomyśl!/ Zastanów się!

[Blackcat2807]

Oh man Duolingo is mad at someone XD