What is the difference between yok and yoktur?
Same question, can we use yok here?
Yes. "Yoktur" means the same as "yok" but it has been added the suffix -dIr, which is used for statements, among other things. Look here: https://forum.duolingo.com/comment/8649151
Hope it helps!
Are “genellikle” and “genelde” the same?
Yes, they have the same meaning.
Why is there not a doctor in school?
Some schools(like mine) can't afford it.
are other word orders possible? if yes, which?
"Genellikle okulda doktor olmaz." worked for me.
Sometimes you answer right but the app sees it wrong because it has different answer saved in it.. For example "genelde okulda doktor var değildir" should work... But it does not