An Indian Linguist
Paoini's life (circa 5th century BC) is unknown, but his work, the Astadhayayi, is a culmination of earlier studies in phonology and grammar.
Pariini's approach to grammar requires that the pieces of words should first be glued together in order. Rules should then be applied to convert these sequences into the correct surface forms. Panini worked on Sanskrit, but we can illustrate his method very well with English. Consider the verb penetrate and its related adjective impenetrable meaning "not able to be penetrated". This consists of the negative prefix
- (as in insane),
the stem and the suffix - ble
So, to start with, we have
Now we need some rules, which we will apply to pronunciation, not necessarily to spelling.