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An auxiliary verb (abbreviated aux) is a verb that adds functional or grammatical meaning to the clause in which it occurs, so as to express tense, aspect, modality, voice, emphasis, etc. Auxiliary verbs usually accompany an infinitive verb or a participle, which respectively provide the main semantic content of the clause. [1]
[E] [F] [G] Even being a logical criterion, its purpose is to make the theory predictive and testable, and thus useful in practice. By contrast, the Duhem–Quine thesis says that definitive experimental falsifications are impossible [ 1 ] and that no scientific hypothesis is by itself capable of making predictions, because an empirical test of ...
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