"Мій дядько не працює взимку."

Translation: My uncle does not work in winter.

[zjedel]

Why can't I use the definite article 'the' before winter? Isn't winter already in the accusative case, marking that it is a direct object?

[GraemeOlson]

You can use an article there, report it.

[va-diim]

"...in the winter" sounds better

[BarryLord1]

"In winter" and "In the winter" are both valid. In British English, the first is more common, but the second doesn't jar too much.

[Neil124366]

Omitting the definitive article "the" leaves the English sentence hanging because winter can also be an adjective. The sentence would be properly complete by ensuring that "winter" is a noun with the addition of "the" or making it an adjective by adding "months"

[BarryLord1]

If you expect sentences to be "properly complete" (or any language to be logical in every respect), you're in for a tough time.

[Gregory693653]

На городі бузина, а в Києві дядько - а well respected reference to uncle in an ancient saying.