Internal Modification
There are several types of internal modification. An internal modification may be segmental, meaning it changes a sound in the root.
An example in English:
STINK + = stank (i becomes a)
An internal modification might be a suprasegmental modification. An example would be a change in pitch or stress.
An example of the latter in English (acute accent indicates stress):
RECÓRD + = récord
Read more about this topic: Exponent (linguistics)
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