Question

Which of the following is not one of the twelve morphological classifications recognized by structural grammarians?

adjective
noun
auxiliary
transform

Answer 1

The twelve morphological classifications of structural grammar include adjective, noun, and auxiliary.  Transform is not one.

Answer 2

The correct answer is D.

The twelve morphological classifications recognized by structural grammarians are:

Noun, verb, adjective, adverb, auxiliary, preposition, determiner, conjunction, pronoun, interrogative, intensive, unnamed class.

Since A (adjective), B (noun) and C (auxiliary) are included in the classification, it is D (transform) with is not included in the recognized classifications.