The lamp at last was lighted.

The lamp has been lighted.

The lamp may have been lighted.

He may have been going to light the lamp.

Structural Parts of the Predicate—Objects

Intransitive verbs are those which, like rise, make assertions the action of which does not involve any person or thing other than the subject.

Transitive verbs are those which, like light, make assertions which involve some person or thing other than the subject in the action of the verb. In the sentence He lighted the lamp, lamp is such an object.

The same verb may sometimes assert one, and sometimes the other kind of action.

The door opened.

He opened the door.