This document discusses verb movement in syntax. It explains that in English, auxiliary verbs like "have" and "be" can appear in the tense slot of a sentence, rather than within the verb phrase, when there is no other verb filling the tense slot. This occurs because the auxiliary verb is said to "move" to the tense position. The document provides examples showing that adverbs can appear before or after the verb phrase but not between the verb and its object, and suggests this is because the verb and object form a syntactic unit. It notes that verb movement also happens in other languages sometimes with all verbs.