Why isn't it possible to say 'I do not understand this text'? Marked as wrong, but later it showed up as the correct answer. It said the correct answer would be 'I do not get this text'. Would you pls check?
"rozumieć" (to understand) takes Accusative, it is negated here, and if a verb that takes Accusative is negated, it takes Genitive instead.
Other cases stay unchanged when negated.
The funny thing here is that this section is supposed to be about education, but it is actually about the study of language. One of my wife's tasks at the University she works is to teach Polish to people from abroad who intend to study at the university - in all subjects. So why no 'textbook' yet? Why no Internet?