Anatomy of a Sentence Subject = Brain! Verb = Heart! Direct or Indirect Objects = Large Intestine Adverbs = Arm Prepositional Phrase =Leg A heart and a brain are essential; without them, a person dies--and so does a sentence. Arms and legs are nice to have; they can be very useful. But it is possible to live without them. You can also omit adverbs and prepositional phrases without killing a sentence. When direct or indirect objects are present, they are part of the core of a sentence and help to complete the, um, idea—but sometimes the objects are absent, and the person is able to live that way. A relative of mine lived to age 99 without her colon!