Translation:Matěj has been in high school for six years.
No one says "at high school". It's always "in high school".
You were heard!
The proposed answer ''Matěj has been in high school for six years.'' is missing a translation of ''už'', isn't it?! Or does the 'has been'-construction include that?
It does.
''Matěj has been attending high school for six years'' acceptable?
I have the same question.
je na vs. navštěvuje/chodí na
