An expression, whether it be a phrase or a single word, is a grammatical unit.
What season was her birth, and when?
A newborn or a mother of etvotre?
Where were you born?
A phrase is a group of words or a single word that serves as a grammatical unit in grammar and syntax. The adjective "very happy" appears in the English noun phrase "the very happy squirrel," for instance. Phrases can be made up of a single word or a whole sentence.
Theoretical linguistics usually examines phrases as syntactic structural elements. Any group of words, or perhaps only one, that has a particular purpose inside the syntactic framework of a sentence is referred to as a phrase. It is not necessary for it to have any additional meaning or value or even to just exist someplace else; it merely has to operate as a complete grammatical unit in the phrase under consideration.
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