The present perfect and definite past time adverbials

Abstract This study examines non-canonical uses of the Present Perfect (PrPf) with definite past time adverbials such as yesterday, last + NP, and ago in British English (BrE) and American English (AmE), drawing on data from the British National Corpus (BNC) and the Corpus of Contemporary American English (COCA) . While quantitatively marginal, these uses reveal a distinctive pattern: in pragmatically marked contexts, especially in spontaneous speech and media, the PrPf encodes both past anchoring and current relevance, violating canonical constraints. I argue that these instances reflect a strategy of relevance compression, where the PrPf functions as a discourse shortcut, simultaneously maintaining topic continuity and signaling temporal relevance. Ambiguous contexts, where current relevance and past perfective readings co-exist, are prevalent in AmE, where a past perfective interpretation may be salient. Ultimately, the study confirms that genre and register shape the distribution and interpretation of tense forms, with innovation concentrated in spoken, spontaneous contexts.