Sentence Diagramming: Infinitives


An infinitive is a verb form with the word to, such as to sing or to walk. An infinitive can function in many ways in a sentence, including as an adjective, subject, or a complement. In sentence diagramming, you should put the to on a slanted line and the verb on a straight line. This activity is designed for students in late Elementary school but is also helpful to middle school students working on sentence structure.