Infinitive

Infinitive is a grammatical term used to refer to certain verb forms that exist in many languages. As with many linguistic concepts, there is not a single definition applicable to all languages. In traditional descriptions of English, the infinitive is the basic dictionary form of a verb when used non-finitely, with or without the particle to. Thus to go is an infinitive, as is go in a sentence like I must go there (but not in I go there). The latter is called the bare infinitive, the former the full infinitive or to-infinitive. In many other languages the infinitive is a single word, often with a characteristic inflective ending, such as manger ("(to) eat") in French, portare ("(to) carry") in Latin, lieben ("(to) love") in German, etc.

Some languages do not have any forms identifiable as infinitives. Many Native American languages and some languages in Africa and Australia do not have direct equivalents to infinitives or verbal nouns. In their place they use finite verb forms in ordinary clauses or various special constructions.

Forms identified as infinitives are generally non-finite verbs in most uses. They may function as other lexical categories, such as nouns, within the clauses that contain them, for example by serving as the subject, object or complement of another verb or preposition. As non-finite verbs, they are generally used without a stated subject, and as a rule they are not inflected to agree with any subject; nor do they normally inflect for other categories such as tense, aspect, mood or voice (although such inflection sometimes occurs to a certain degree, for example Latin has distinct active and passive infinitives).

Other non-finite verb forms which often share many of the above properties (but are not classed as infinitives) include participles, gerunds and gerundives.