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In linguistics, a 'defective verb' is a verb with an incomplete conjugation. Defective verbs cannot be conjugated in certain tenses, aspects, or moods.
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Contents

Defective verbs in English

Impersonal verbs in English

Defective verbs in Latin

Examples from other languages

Defective verbs in English

The most commonly recognized defective verbs in English are the class of preterite-present verbs, ''can'', ''may'', ''shall'', and ''mote''/''must'', plus ''will'' (which was not historically a preterite-present but has joined the class in modern English). Though these verbs were not originally defective, in most varieties of English today, they occur only in a modal auxiliary sense. However, unlike normal auxiliary verbs, they do not regularly conjugate in the infinitive mood. Therefore, these defective auxiliaries do not accept each other as objects. Additionally, they do not regularly appear as participles.
Beyond the modal auxiliaries, ''beware'' is a full-fledged defective verb of English: it is used as an imperative ("Beware of the dog") and an infinitive ("I must beware of the dog"), but very rarely or never as a finite verb, especially with inflectional endings (
★ ''bewared'',
★ ''bewares''). Certain other verbs are defective only in specific constructions. For instance, in the "''try and''" construction (meaning 'try to'), ''try'' may only be used in forms with no inflectional endings. Thus ''I try and do it every week'' is possible, but not
★ ''She tries and does it'' or
★ ''She tries and do it''.

Impersonal verbs in English

Impersonal verbs such as "rain" and "snow" share some characteristics with the defective verbs in that conjugations such as "I rain" or "they snow" are not often found; however, the crucial distinction is that impersonal verbs are "missing" certain forms for semantic reasons — in other words, the forms themselves exist and the verb is capable of being fully conjugated with all its forms (and is therefore not defective) but some forms are unlikely to be found because they appear meaningless.
Nevertheless, native speakers can typically use and understand metaphorical or even literal sentences where the "meaningless" forms exist, such as:

★ I rained on his parade.

★ I tried to help by clearing their drive but instead I snowed them in.
Contrast the ''impersonal verb'' "rain" (all the forms exist even if they sometimes look semantically odd) with the ''defective verb'' "shall" (only "I shall" and "I should" are possible):

I rain		I shall
I rained		I should
I am raining		''I am shalling''    (not a possible conjugation)
I have rained		''I have shalled/should''   (not a possible conjugation)
to rain		''to shall''    (not a possible conjugation)

Defective verbs in Latin

Latin has defective verbs that possess forms only in the perfect tense system; such verbs have no present tense forms whatsoever. However, these verbs are present in ''meaning''. For example, the first-person form ''odi'' and infinitive ''odisse'' appear to be the perfect tense of a verb such as ''
★ odo'', but in fact have the present-tense meaning "I hate". Similarly, the verb ''memini'', ''meminisse'' is conjugated in the perfect:
:meminī
:meministī
:meminit
:meminimus
:meministis
:meminērunt
Instead of "I remembered", "you remembered", etc., these forms signify "I remember", "you remember", etc. Latin defective verbs also possess regularly formed pluperfect forms (with a simple past tense meaning) and future perfect forms (with a simple future tense meaning). Compare deponent verbs, which are passive in form and active in meaning.

Examples from other languages

★ French: ''frire'' (lacks a passé ''simple''), ''éclore'' (lacks an imperfect)

★ Spanish: ''abolir'' (this is disputed, but some contend that there is no
★ ''él abole'', for example)

★ Polish: ''widać'', ''słychać'' (the only form of these verbs that exists is the infinitive)

★ Portuguese: a large number of Portuguese verbs are defective in person, i.e., they lack the proper form for one of the pronouns in some tense. The verb ''colorir'' ("to color") has no first person singular in the present (thus requiring a paraphrase, like ''estou colorindo'' ("I am coloring") of the use of another verb of similar meaning, like ''pintar'' ("to paint").

★ Dutch: in Dutch there are four defective verbs (apart from deponent verbs and impersonal verbs): 'plegen' (to be used to), 'zullen' (shall), 'zijn' (to be) and 'wezen' (to be). The verbs ''zullen'' and ''plegen'' do not have any perfect tenses. Furthermore, ''zullen'' does not have any future and past future tenses, and its conditional mood does not exist. The verbs 'zijn' and 'wezen' are used to complete each other's conjugation. A part from the infinitive (''zijn'' versus ''wezen'' (to be)) and gerund (''het zijn'' versus ''het wezen'' ((the) being)), only the simple present subjunctives of both verbs exists (''ik zij'' versus ''ik weze'' (I be)). For all other forms there only exists one form:e.g. ''zijnde'' (being) (present participle of 'zijn'), ''ik was'' (I was) (indicative past simple of 'wezen'). (See Dutch conjugation)