Functional grammar (FG) is a model of [[grammar]] motivated by [[Functional theories of grammar|functions]].<ref>{{cite journal|last1=Hurford|first1=J|year=1990|title=Nativist and functional explanations in language acquisition|work=Logical Issues in Language Acquisition|editor-last=Roca|editor-first=I. M|pages=85–136|___location=Foris, Dordrecht|url=http://www.isrl.uiuc.edu/~amag/langev/paper/hurford90nativist.html|journal=|access-date=2010-06-12|archive-url=https://web.archive.org/web/20080516095612/http://www.isrl.uiuc.edu/~amag/langev/paper/hurford90nativist.html|archive-date=2008-05-16|url-status=dead}}</ref> The model was originally developed by [[Simon C. Dik]] at the [[University of Amsterdam]] in the 1970s,<ref>{{cite book|last=Dik|first=Simon C.|title=The Theory of Functional Grammar, Parts 1 & 2|edition=1|year=1989}}</ref> and has undergone several revisions since then. The latest standard version under the original name is laid out in the 1997 edition,<ref>{{cite book|url=https://books.google.com/?id=qeMLE_5uvHcC|last=Dik|first=Simon C.|year=1997|title=The Theory of Functional Grammar, Part 1: The Structure of the Clause|edition=2|___location=Berlin|publisher=Mouton de Gruyter|isbn= 9783110154047}}</ref> published shortly after Dik's death. The latest version features the expansion of the model with a pragmatic/interpersonal module by Kees Hengeveld and Lachlan Mackenzie.<ref name="Hengeveld2008" /> This has led to a renaming of the theory to functional discourse grammar. This type of grammar is quite distinct from [[systemic functional grammar]] as developed by [[Michael Halliday]] and many other linguists since the 1970s.
The notion of "function" in FG generalizes the standard distinction of [[grammatical function]]s such as [[grammatical subject|subject]] and [[grammatical object|object]]. Constituents ([[parts of speech]]) of a linguistic [[utterance]] are assigned three types or levels of functions:
