Is could an adjective?

Answer:
No, adjectives are words that describe something else (a noun).
For example, in the phrase "the brown dog", brown is the adjective and dog is the noun.
"Could" is the imperfect future tense of the verb "can".
Contributor: Jim
First answer by Jim Jimmers. Last edit by Brospeed2001. Contributor trust: 3 [recommend contributor recommended]. Question popularity: 2 [recommend question].