Why is (A fiú a lany mögött átt) and in english is The boy stands behide the girl it told me it was wrong WHAT.
are you sure your spelling was right?
Yea I guessed the same. The app wants you to use other tense- he IS standING next to her - which for me is the absolute equal for yours - he stands next to her.
What is the difference between mögött and hátul ?
mögött - behind, so behind relative to something
hátul - in the back, so relative to the given space