Of the two verbs in a sentence, the object of the object of the first one is at the same time the subject of the second one. This element, which is used as both the object and the subject in the sentence, is called the pivot, and the sentence of this kind are known as pivotal sentences. In another word, the pivotal sentence is formed by nesting a verb-object phrase with a subject-predicate one. The object of the verb-object phrase is at the same time the subject of the subject-predicate phrase.