A matrix sentence is a sentence in which a clause has been embedded as a constituent .
The clause may or may not be an immediate constituent , but it must be embedded by means other than coordination .
(English)
In the following sentences, the dog died is the matrix sentence:
Lyons, John. 1968.Introduction to theoretical linguistics. Cambridge, England: Cambridge University.
Crystal, David. 1980.A first dictionary of linguistics and phonetics. Boulder, CO: Westview.