On grammatical class:

kei
elidable terminator: end abstraction bridi (often elidable).

In notes:

fa'orma'o
x1 is the terminator of structure originated by selma'o x2 in language x3.
fegmliba'u
m1=f1=b1 grumbles with sound b2 at f2 because of f3 (action/state/property).