I think Figure 6-9 is meant to exemplify ellipsis... ‘(look at) those two (things), (look at) those (things), which (thing)?’
Unfortunately this is obscured by re-labelling Deictic or Numerative as ‘Head’, as part of the argument for analysing nom gps as a hypotactic word complex, with a wandering Head. V confusing (and now superfluous*) .
Demonstratives as Thing are very common in English. Eg from the preceding para in IFG ‘But this is not so’, or my preceding para ‘Unfortunately this is obscured’.
You’re right, demonstratives are certainly not substitutes. The canonical substitute is ‘one’ which often serves as Thing... those ones, which one? I used ‘possessive substitutes’ for personal pronouns ‘yours/mine’ etc, which always serve as Thing... those ones are mine, which one is yours? (Do these combine substitution with personal reference... my one, your one ??)
All this and more is why we need a description of English nom gps with Thing realised as pronoun, both personal and demonstrative. (Then you’d have something consistent to compare with Spanish.)
*simpler analysis first proposed by Matthiessen (1995), then Martin, Matthiessen, Painter (2010), now Martin, Doran, Zhang (2021)
- Problems With The 'Perspective' Subtype Of Focus
- A Serious Problem That Invalidates The 'Dimensional' Subtype Of Focus
- Serious Problems That Invalidate The 'Classifying' Subtype Of Focus
- A Problem With A Further Proposed 'Classifying' Type Of Focus
- The Problem With Exercise 5: Recognising Pre-Elements
- Problems With Exercise 4: Analysing Groups With Focus