1. Diagnostic: Consciousness
Halliday & Matthiessen (2004: 212):
… while one participant in a ‘mental’ clause, the Senser, is always endowed with consciousness, this is not the case with ‘relational’ clauses.
2. Diagnostic: Projection
Halliday & Matthiessen (2004: 213):
With a ‘mental’ clause, the phenomenon of consciousness can be construed as an idea brought into existence through the process of consciousness and represented grammatically as a separate clause … but this is not possible with ‘relational’ clauses.
