This is fairly straightforward as long as you know all the assigned morphemes. Since these changes happen regularly in certain situations, linguists write rules which describe the alternation. This way, you don't need to memorize dozens of different allomorphs. You can simply learn the rule and apply it over and over with many morphemes in a variety of different situations. One frequent allomorphy process that was discussed is Unit 2 is assimilation .
Sounds often change to become more like surrounding sounds.
Listen carefully to the way people pronounce this word in ordinary conversation. You'll find that often speakers actually say . The other most frequent types of predictable allomorphy involve insertion of sounds or the deletion of sounds. Here, n is the sound affected , m is the new sound , and p, b and m are the critical nearby sounds . The underline in the context component of the rule stands for the sound affected .