A complete sentence is made of two parts: a subject and a predicate. The subject tells who or what does the action of the sentence. The predicate states what the subject is being or does. The predicate always contains a verb, which is an action or state of being word. To make your writing and speech grammatically correct, the subject must agree with, or match, the verb. Take the sentence: "The monster jumps over the moon." The subject is "the monster" and the verb is "jumps." "Monster" is a singular noun and "jumps" is the singular form of the verb $"$to jump." What is the subject of the sentence below? The sandwich contains chocolate chips and marshmallows. A contains B chocolate chips C sandwich D marshmallows