Misrepresenting The Logical Structure Of Negative Verbal Groups

Martin, Matthiessen & Painter (2010: 181):

In general, negative polarity is realised through the modal adverb not. As we have already noted, it may be fused with the Finite verb expressing primary tense or modality: don’t (know), shouldn’t (have come). In such cases the verb in question can be analysed as carrying both polarity and modality: 

Blogger Comments:

To be clear, here the authors misrepresent the logical structure of verbal groups by including the Event as an element in their notation. Halliday & Matthiessen (2014: 411n): 

A major point of difference between the verbal group and the nominal group is that the Event (unlike the Thing) is not the point of departure for the recursive modifying relationship. Hence it does not figure as an element in the notation.

The logical structure of the first example is thus:

and the second:

In modalised verbal groups, the distinction between 'past' came, 'past in present' has come and 'past in past' had come is neutralised, and represented by the form have come. See Halliday (1994: 201-4).