Tense–aspect–mood, commonly abbreviated and also called
tense–modality–aspect or , is the
grammatical system of a language that covers the expression of
tense (location in time),
aspect (fabric of time – a single block of time, continuous flow of time, or repetitive occurrence), and
mood or
modality (degree of necessity, obligation, probability, ability). In some cases,
evidentiality (whether evidence exists for the statement, and if so what kind) may also be included.