What is grammar of English?

The correct answer to this question is B, At the end of the story, they were living happily ever after. Subject - they; Verb - were living . In a sentence, the subject is the person, place, or thing which is doing something. They is the subject in this sentence, because they are the persons doing something, If a verb in a sentence can be found, so can the subject. A verb is an action in a sentence, which is what the subject is doing. The verb can be either physical or mental. In this sentence, the action is were living, which is the verb.