As a result of contact between mutually unintelligible Southern Chinese varieties like Hokkien and Cantonese, Colloquial Singapore Mandarin (csm) 有 yǒu ‘have’ has extended its semantic functions to include that of realis modality marker. This paper will demonstrate how a framework of ambiguity and semantic continuity can allow us to determine the associative links between different synchronous functions of the 有 yǒu ‘have’ construction. The ambiguous context that links the existential and realis modality functions of 有 yǒu ‘have’ is [没有
méi yǒu ‘not have’ + vp]. This ambiguous context allows 有 yǒu ‘have’ to be reanalyzed as a realis modality marker with méi ‘not’ as the negator. Additionally, the semantic continuity between the existential and realis modality marker functions further confirms such an association. While [yǒu + np] affirms the existence of someone or something, [yǒu + vp] affirms the existence of an event.