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In page Deixis:

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Temporal, or time, deixis is used to refer to time relevant to the utterance. This includes temporal adverbs (e.g. then and soon), nouns (e.g. tomorrow) and use of grammatical tense.[1] Temporal deixis can be relative to the time when an utterance is made (the speaker’s "now") or the time when the utterance is heard or seen (the addressee’s "now").[citation needed] Although these are often the same time, they can differ in cases such as a voice recording or written text. For example: