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A simple subject is the person or thing doing the action of the  verb.    Example:   The boy is day dreaming.    In this sentence, the boy is the person doi â¦ ng the action (day  dreaming). The boy is the simple subject.
Piece is the simple subject. Likewise, a predicate has at its centre a simple predicate, which is always the verb or verbs that link up with the subject. In the example we just considered, the simple predicate is would satisfy -- in other words, the verb of the sentence.