Abstract
The following article seeks to raise the problem of mode of being from the phenomenon of time. The presentation of the different problems about the mode of being in the theme of the fundamental ontology is presented. The first problem refers to the primary mode of presentation of Dasein as «starting point» around the modes of being in general. The second problem of modalization consists in the characterization of the different ways of being based on the phenomenon of the world: the world is the domain that makes possible the manifestation of the different ways of being. The third fundamental problem of modalization, from which the proposal of the present essay departs, refers to the temporal character of the modes of being, in this case, both of the behaviors referred to these modes, and of the comprehension of the sense of be carried out in each of them. The project of fundamental ontology consists precisely in a thematization that tries to access and understand the meaning of being from the horizon of time and thus expose the modalities of being of the entity from its temporary nature. The investigation focuses on the modes of being of Existence (Existenz) of Dasein, the mode of being of handiness (Zuhandenheit) and the objective present (Vorhandenheit). A double interpretation is required, proposed by Heidegger: temporal and Temporal. The proposal is to sustain that, in the stage of fundamental ontology, Heidegger has made time «the most prior to everything», that is, the horizon from which all modality of the entity is understood and that from which the ontology is possible as a science.

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