Morphology (linguistics)
There are two types of bound morphemes: derivational and inflectional. Inflectional morphemes give a listener or reader information about how the word is used in a sentence.  English does not have a lot of inflectional morphemes. An example of an inflectional morpheme in English is the -ed suffix for verbs.  This morpheme at the end of a verb lets the speaker know that the action happened in the past.  Another example is the -s suffix for nouns to show that there is more than one of the noun.