Editing Morpheme (section)

===Content vs. function===
[[Content morpheme]]s express a concrete meaning or ''content'', and function morphemes have more of a grammatical role. For example, the morphemes ''fast'' and ''sad'' can be considered content morphemes. On the other hand, the suffix ''-ed'' is a function morpheme since it has the grammatical function of indicating [[past tense]].

Both categories may seem very clear and intuitive, but the idea behind them is occasionally more difficult to grasp since they overlap with each other.<ref>{{cite web|title=Morphology II|url=http://www.ling.upenn.edu/courses/Fall_1998/ling001/morphology2.html|access-date=10 April 2014|archive-date=16 March 2014|archive-url=https://web.archive.org/web/20140316184334/http://www.ling.upenn.edu/courses/Fall_1998/ling001/morphology2.html|url-status=live}}</ref> Examples of ambiguous situations are the [[preposition]] ''over'' and the [[determiner]] ''your'', which seem to have concrete meanings but are considered function morphemes since their role is to connect ideas grammatically.<ref name="language files">{{cite book|title=Language files: Materials for an introduction to language and linguistics|date=2011|publisher=Ohio State University Press|author=Department of Linguistics|edition=11th}}</ref> Here is a general rule to determine the category of a morpheme:
* Content morphemes include free morphemes that are nouns, [[adverbs]], [[adjectives]], and main verbs and bound morphemes that are bound roots and derivational affixes.<ref name="language files" />
* Function morphemes may be free morphemes that are prepositions, [[pronoun]]s, determiners, auxiliary verbs and [[Conjunction (grammar)|conjunctions]]. They may be bound morphemes that are inflectional affixes.<ref name="language files" />