Inflectional

The inflectional affixes can be schematized as follows :
Dogs, oxen, mice : noun plural
Boy’s                  :  noun singular possessive
Boy’s, men’s       : noun plural possessive
Vacates              : present third-person singular
Discussing          : present participle
Chewed            : past tense
Chewed, eaten, swum : past participle
Bolder, sooner, nearer : comparative
Boldest, soonest, nearest : superlative The words to which these affixes (suffixes and infixes) are attached are called stems. The stems include the base or bases and all derivational affixes. Thus the stem of play boy and that of beautified is beautify.
The inflectiobnal suffixes differ from the derivational suffixes in the following ways, to which there are few exceptions :

• They do not change the part of speech, Example:sleds, sleds (both nouns); cough, coughed(both verbs);cold, colder (both adjectives)

• They come last in word., Example : shortened, villainies, industrializing

• They go with all stems of a given part of speech., Example : he eats, drinks, dreams, entertains, motivates

• They do not pile up ; only ends a word, Example : flakes, working, higher, written 

The exception here is (s,pl,ps) the plural posseives of the noun, as in “ The students worries”