"He is out to lunch now."

Translation: Teď je na obědě.

[dsarkarati]

The corrected version was given as "On je teďka na obědě." The sentence I wrote was "On je teď venku na obědě." Is "ted'ka" a more colloquial form for "now" like "dneska" is for "today"? Is my sentence unacceptable because "venku" need not be included?

[JanLyko]

Exactly, you understand it right. Dneska and teďka are equally colloquial and venku is not used in this sentence. (However, you can specify "Je teď ve městě na obědě").

[LaynePierc1]

should be "he is at lunch"

[VladaFu]

It is accepted.