Well, we can teach animals vocabulary but I'm not aware of any success in teaching grammar where "eat banana" and "banana eat" convey different concepts. Peopl

Well, we can teach animals vocabulary but I'm not aware of any success in teaching grammar where "eat banana" and "banana eat" convey different concepts. People have been trying for a long time without any success that I'm aware of in birds or other primates. What the limits are is very much an area of active research.