The main claim of this paper is that the speech act by ‘Quasi-Quotation’ (named after direct/indirect quotation) utterances, ending in the quotative particle ‘-(ta)ko’, may be convincingly explained by revealing the multi-functional and polysemic nature of the particle ‘-(ta)ko’. This quotative particle, as a marker of evidentiality, is taken to signal the speaker’s attitudinal force which falls somwhere within a continuum of commitment. The speaker’s attitude towards what he is saying, without explicit articulation of a performative predication, is allegedly he is saying, without explicit articulation of a peromative predication, is allegedly shown to encode a variety of pragmatic strengthening through contiguity between categorical assertion and softened statement. Though more feature of explicit ‘Quasi-Quotation’ in casual speech doesn’t share the feature of explicit recoverability of the reportive performative ‘X-ga Y-eke [...]-ko malhayssta’, we suggest, they are actually performative utterances with the form and status of assertions of fact, which express the speaker’s subjective attitude, make for different assertions or different kinds of knowledge. We propose that the gradability of subjective meaning of ‘-tako’ ending, assertive or empathetic, thorough contiguity, may be defined by the individuality of the subjective domain set, which contributes to the contextualization of increased speaker commitment towards the truthfulness of ‘Quasi-Quotation’. The mapping from subjective individuation to performative predication is shown to be an essential part of the general properties of epistemic modality adhering to the speaker’s attitudinal fore. The distinction between reported speech and perspectivized speech is also shown to be conceptually relevant to elucidating the strengthening role of the speaker’s commitment and epistemic modality. On the basis of dividing the speaker’s domain set into two distinctive subsets for both 1st-person speaker and 3rd-person characters, the speaker’s ubjectivity. Finally, we show that the prevalent use of‘-telako’ in casual conversation, with the retrospective ending ‘-te-’, may be significantly characterized by intervening in the speaker’s subjective roles of commitment and consciousness.