This article attempts to highlight the problems in teaching and learning of two Portuguese periphrastic modal constructions. The aforementioned problem is related to polysemy of periphrases with dever and supposed synonymy in specific contexts of those periphrases.
The purpose of the article is to present the issue of the naming and the origin of the Portuguese inflected infinitive. We will present a number of opinions of various linguists on the topic. We will also try to answer the question whether the Portuguese inflective infinitive is a purely Portuguese phenomenon or there are other languages in which a similar verbal form can be observed.
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