In 'Tones for real", 2/5/2018, John McWhorter expresses his frustration as an American learner of Chinese: "How much must I attend to the damned tones in a sentence, as opposed to in citation, to really speak this language?"
As John very well knows (when he's not frustrated by the difficulties of learning a new language), his question has the same answer as the analogous question "How much must I attend to the damned consonants and vowels in a sentence, as opposed to in citation, to really speak this language?" Fluent native speakers almost never use standard citation forms in fluent speech — sometimes the fluent versions are reduced or assimilated or dissimilated versions of the citation forms, and something they're just variably different. This is partly because informal speech is variably non-standard, but mostly because of the complex effects of linguistic and communicative contexts on the phonetic realization of phonological categories.
Unfortunately for language learners, these complex effects (though in some sense "natural") are different in different languages and dialects/varieties, so you can't just use your normal phonetic habits and expect the results to sound right. And we can use John's own pronunciation of English to illustrate some of these contextual effects.
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