In standard Spanish, presentational 'haber' (‘there-to-be’) is an impersonal construction: it only takes the third person singular verb-ending and its nominal argument, e.g. mangos ‘mangoes’ in (1), behaves as a direct object. However, there seems to be a growing tendency to establish verb-agreement with the NP (cf. D'Aquino-Ruiz, 2008), which is known as the pluralization of 'haber'. From a construction-grammar
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