What is the complete subject in this sentence? Elizabeth and Mr. Darcy teach each other a lesson about pride.

Answer: The complete subject is Elizabeth and Mr. Darcy.

Explanation:

The subject, commonly a noun, a noun phrase or a pronoun, usually occurs at the beginning of the sentence to indicate who/what performs the action. In this case, Elizabeth and Mr. Darcy is the subject, as both of the nouns perform the action of teaching. The rest of the sentence forms a predicate, which provides further information about the subject. There are two objects in the sentence: indirect - each other, and direct - a lesson about pride.