Don't know where else to put this since it's just a general note on the genitive lesson given here––but I wish that it would show the genitive PLURAL forms as well as the singular. Right now only the latter is taught.
Genitive plural has its own skill further down the tree.
Where does the пь sound go in this sentence?
my brother still drinks tea should be accepted чайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчайчай