ABSTRACT
Traditionally, the sentence is the highest unit of analysis in grammar. Sentences are composed of clauses, clauses of phrases, phrases of words, and words of morphemes (the smallest unit). But at each level of analysis, a higher unit may consist of only one unit of the lower level. So a phrase may consist of one word, as we have seen in a number of places. Indeed, it is possible for a sentence to consist of just one morpheme: Listen! In some approaches it is also maintained that there is a level of analysis above the sentence; see B11 for more on this.
