A secondary verb, used for conjugating some tenses. In many languages, the inflection of verbs in some tenses requires the use of an auxiliary verb form. For instance, in English, to indicate that an action occured in the past, you can say "I have eaten", "we had seen", or "you were dreaming". In the first two examples, a form of the auxiliary to have is used to denote past tense forms; in the third example, the auxiliary used is to be.
Auxiliary verbs function as model verbs, and thus sit within the same inheritance hierarchy of conjugation rules. However, they have two additional features:
As with ModelVerb instances, each AuxiliaryVerb instance is defined by an XML file in {language}/model-verbs
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@author Duncan Roberts
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