My family are from Moravia and i would have written 'Kupuju' instead, is that just because its a slightly different dialect?
There is a comment on some other lesson which confirms your assumption and says that it must bei “-uji” in standard Czech.
I miss the Tips and Notes on the Adverbs lesson. I can open the page and there is the word Adverbs but no other text. Anyone else has this problem?
But I had some good tips from Praha2017;
But you can find useful information about Czech Grammar on these sites:
But still the Tips and Notes were very useful and handy and to the point of the subject.