Can also be translated as
Mwalimu akifundisha, hatuongei (a more casual way of speaking)
Ongea and Zungumza both mean speak or talk.
Could "hatusemi" work here, in place of "hatuzungumzi?"
Hatusemi means "we won't say" or "we won't tell" therefore it won't really work in place of hatuzungumzi.