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An infinitive is the most basic form of a verb. It is “unmarked” (which means that it is not conjugated for tense or person), and it is preceded by the particle to.
Infinitives are known as non-finite verbs, meaning they do not express actions being performed by the subjects of clauses. Instead, infinitives function as nouns, adjectives, or adverbs to describe actions as ideas.
Infinitives are distinct from a similar construction known as bare infinitives or the base forms of verbs, which are simply infinitives without the particle to.
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see moodmood
or mode,
in verb inflection, the forms of a verb that indicate its manner of doing or being. In English the forms are called indicative (for direct statement or question or to express an uncertain condition, e.g.
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; tensetense
[O.Fr., from Lat.,=time], in the grammar of many languages, a category of time distinctions expressed by any conjugated form of a verb. In Latin inflection the tense of a verb is indicated by a suffix that also indicates the verb's voice, mood, person, and number.
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an indefinite form of the verb that can function syntactically as the substantive to provide the general name for an action or process, in many languages without reference to person, number, tense, or mood. It can have aspect, voice, and sometimes tense. A number of languages have various forms of the infinitive.

References in periodicals archive ?
When answering the research questions proposed here, neighborhood density of infinitival forms (all the words generated by the addition, deletion or substitution of a single phoneme) will be manipulated to determine whether neighborhood effects in regular and irregular verbs can be observed.
31) If the complement of a main predicate denotes future and will definitely happen (or will not happen), the complement cannot take an infinitival form.
To form complex predicate, it must not be an infinitival NP.
multiple negation; a free-form negative marker na(e); relative at (shared by a large number of varieties); the non-existence of for to in infinitival purpose clauses; the non-existence of non-standard use of them and us; the use of pronominal gender; special systems of reflexive pronouns; special uses of yon, the definite and indefinite articles; the non-existence of double comparatives/superlatives.
For example, bare infinitival complements are only felicitous following verbs of involuntary visual perception if the perception is not immediate: * Je vois neiger 'I saw snow' but J'ai vu neiger 2 fois dans ma vie 'I saw snow twice in my life' (Achard 1993).
To have a bottle of burgundy" is an infinitival complement which is normally taken to have the underlying form of a propositional construction.
is/is not and does/does not), future modal "will" (He will run), the regular past tense "-ed" (She painted the chairs), infinitival "to" (He likes to run), copular and auxiliary "be" (He is big.
Similarly, modals started to appear in combination with infinitival verb forms, past participles began to be preceded by auxiliaries, and irregular forms started to emerge.
3e is the schema for past-tense forms that end in an alveolar and are identical to the infinitival forms.
But the clause boundary before the infinitival to leaves LDA as the only structure for 28b.
Perhaps this was the motive for omitting the infinitival to in its verb definitions, but by doing so OACD loses an essential signal of verbness, without which it can take a moment for the brain to sort out whether one is dealing with a verb or a noun.