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Tense, aspect, and mood are grammatical categories concerned with different notional facets of the event or situation conveyed by a given clause. They are prototypically expressed by the verbal system. Tense can be defined as a category that relates points or intervals in time to one another; in a most basic model, those include the time of the event or situation referred to and the speech time. The former may precede the latter (“past”), follow it (“future”), or be simultaneous with it (or at least overlap with it; “present”). Aspect is concerned with the internal temporal constituency of the event or situation, which may be viewed as a single whole (“perfective”) or with particular reference to its internal structure (“imperfective”), including its being ongoing at a certain point in time (“progressive”). Mood, in a narrow, morphological sense, refers to the inflectional realization of modality, with modality encompassing a large and varying set of sub-concepts such as possibility, necessity, probability, obligation, permission, ability, and volition. In the domain of tense, all Germanic languages make a distinction between non-past and past. In most languages, the opposition can be expressed inflectionally, namely, by the present and preterite (indicative). All modern languages also have a periphrastic perfect as well as periphrastic forms that can be used to refer to future events. Aspect is characteristically absent as a morphological category across the entire family, but most, if not all, modern languages have periphrastic forms for the expression of aspectual categories such as progressiveness. Regarding mood, Germanic languages are commonly described as distinguishing up to three such form paradigms, namely, indicative, imperative, and a third one referred to here as subjunctive. Morphologically distinct subjunctive forms are, however, more typical of earlier stages of Germanic than they are of most present-day languages.
We discuss the modal uses of the Hausa exclusive particle sai (≈ only). We argue that the distribution of sai in modal environments provides evidence for the following claims on the composition of modal meaning that have been independently made in the literature: i) Future-oriented modality involves a prospective aspect operator that can be realized covertly in some languages (e.g. English, Kratzer 2012b) and overtly in others (e.g. Gitksan, Matthewson 2012, 2013). ii) Necessity interpretations arise from exhaustifying possibilities, i.e. an exhaustivity operator applying to existential modality (e.g. Kaufmann 2012 for the case of imperatives and Leffel 2012 for a relevant analysis of necessity meaning in Masalit). We show that future-oriented necessity in Hausa decomposes into EXH((PROSP)), with sai contributing exhaustivity.
This thesis investigates temporal and aspectual reference in the typologically unrelated African languages Hausa (Chadic, Afro–Asiatic) and Medumba (Grassfields Bantu). It argues that Hausa is a genuinely tenseless language and compares the interpretation of temporally unmarked sentences in Hausa to that of morphologically tenseless sentences in Medumba, where tense marking is optional and graded. The empirical behavior of the optional temporal morphemes in Medumba motivates an analysis as existential quantifiers over times and thus provides new evidence suggesting that languages vary in whether their (past) tense is pronominal or quantificational (see also Sharvit 2014). The thesis proposes for both Hausa and Medumba that the alleged future tense marker is a modal element that obligatorily combines with a prospective future shifter (which is covert in Medumba). Cross-linguistic variation in whether or not a future marker is compatible with non-future interpretation is proposed to be predictable from the aspectual architecture of the given language.