Question

Of course you have to be hard-working to learn here. But teachers are mostly friendly, so if you are polite and respectful, you’ll have no problems here.
czy tojest poprawnie napisane

Answer 1

Of course you have to be hard-working to study here. But most of the teachers are friendly, so if you are polite and respectful, you'll have no problems here.

Twoja wersja nie była zła, ale poprawniej będzie wyglądać, tak jak jest napisane powyżej.