Portuguese verb conjugation - Wikipedia
https://en.wikipedia.org/wiki/Portuguese_verb_conjugation
Those whose infinitive ends in -er belong to the second conjugation (e.g. correr, comer, colher); Those whose infinitive ends in -ir belong to the third conjugation (e.g. partir, destruir, urdir); The verb pôr is conventionally placed in the second conjugation by many authors, since it is derived from Old Portuguese poer (Latin ponere).
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