Ngo, Hood, Martin, Painter, Smith & Zappavigna (2022: 182):
In the unmarked case, salient syllables highlight content words (not grammatical ones) and assign a secondary degree of prominence to that information in the discourse. However, in (17) there are two marked instances where grammatical words are made salient: not in the second tone group and is in the third.
These marked choices give prominence to contrastive positions in the discourse (in this case, that which is and is not knowledge). In the first two tone groups the tonic syllables (in bold) carry tone 4 pitch contours. This falling-rising tone movement indicates pending meaning. The tone 1 of the third tone group signals completion.
Blogger Comments:
To be clear, with regard to TONE, it is tone 3 that serves this textual function (Halliday & Matthiessen 2014: 440), and it is likely that the speaker selected tone 3, not tone 4. Tone 4 would be unlikely here because it would realise 'reservation' in terms of KEY, which is inconsistent the proposition being enacted. The fall-rise of tone 4 signals 'seems certain (fall) but isn't (rise)'.
In terms of TONALITY and TONICITY, it is likely that the second tone group actually consists of two tone groups, with the first tonic on not, to mark the contrast as New information for student audience.
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