Final answer:
Attributive adjectives must match the head noun in gender, number, and case. These adjectives come before the noun they describe, forming an adjective phrase if modified by additional words like comparatives or qualifiers.
Step-by-step explanation:
Attributive adjectives must agree in gender, number, and case with the head noun. An attributive adjective is a descriptive word that is placed before the noun it modifies and gives more information about the noun. For example, in the sentence 'I need to find an affordable car,' the adjective 'affordable' is modifying the noun 'car' and would agree with it in gender, number, and case if such grammatical categories apply in the language of the sentence.
Another example is 'Ms. Chu needs to find a more reliable car.' Here, the adjective phrase 'more reliable' is used to modify the noun 'car' and again must agree with the noun in gender, number, and case. The adjective phrase includes the comparative word 'more' and the adjective 'reliable.'