Most grammars classify verbs into transitive and intransitive. Transitive verbs take an object: I read the book. She values your criticism. Priestley discovered oxygen. Intransitive verbs do not take an object: I sleep on a futon. She sings beautifully. The Kingsleys live in a brick house. Many verbs, of course, sometimes take an object and sometimes do not. In other words, they can be transitive or intransitive depending on how they are used. The verb read, for example, is transitive in I read the book but intransitive in I usually read in the evening. Here are a few other examples:
