This paper aims to explicate, from a unified point of view, the differences in meaning and cooccurrence restriction between
be going to and
will, and a diversity of their uses in contemporary English. It presents the temporal structures of
be going to- and
will-sentences which provide an explanatory basis for these phenomena. It is argued that the notion of temporal focus is necessary in order for the temporal structures to have a more explanatory power. It is demonstrated that these temporal schemata not only systematically explain both synchronic and diachronic aspects of
be going to and
will, but also account for why
be going to in the past tense tends to express unfulfilment of the infinitive part while
will in the past tense does not.
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