Answer:
Sentence:
After drinking old milk, Juan turned green.
Subject <u> </u><u>Juan </u>
Linking Verb <u> </u><u>turned </u>
Adjective <u> </u><u>green </u>
Explanation:
A subject in an English sentence refers to the thing or person the sentence is about.
A linking verb is a verb that connects the subject of a sentence to its adjective.
An adjective is a word that describes or modifies the qualities of a noun.
Juan is the subject because she is the one being talked about, turned is the linking verb because it creates a relationship between the subject and adjective while green is the adjective because it describes the noun (Juan).