In linguistics, a bound morpheme is a morpheme (the elementary unit of morphosyntax) that can appear only as part of a larger expression, while a free morpheme (or unbound morpheme) is one that can stand alone. A bound morpheme is a type of bound form, and a free morpheme is a type of free form.

Occurrence in isolation

A form is a free form if it can occur in isolation as a complete utterance, e.g. Johnny is running, or Johnny,

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