An existential clause is a clause, having a distinctive grammatical structure, which expresses the real or imagined existence of an entity.
An existential clause often introduces an entity into a discourse .
(English)
The clause construction “there + verb [typically be] + noun phrase” forms an existential clause, as in:
Quirk, Randolph, S. Greenbaum, G. Leech, and J. Svartvik. 1985.A comprehensive grammar of the English language. London: Longman.
Crystal, David. 1985.A dictionary of linguistics and phonetics. 2nd edition. New York: Basil Blackwell.