Cohesively & Tactically Related Free Clauses
Halliday & Matthiessen (2004: 603):
When the domain of manifestation is a cohesive sequence of clauses, or a paratactic nexus of (free) clauses, the two figures related by expansion are enacted interpersonally as propositions or proposals. This means that each can be negotiated in its own right — accepted or denied, complied with or refused, and so on… . The same is true of the dominant (a) clause of a hypotactic nexus, since if it is a free clause, it realises a negotiable proposition or proposal.
Dependent Clauses
Halliday & Matthiessen (2004: 603):
… while the dependent (b) clause supports a proposition or proposal, it does not constitute one itself; and if it is non-finite, it is even further removed from the realm of negotiation.
Simple Clauses
Halliday & Matthiessen (2004: 603):
… when the causal [eg] relation is construed within the Process, it has become propositionalised or proposalised… . Here it is no longer the cause or the effect that is held up for negotiation but rather the causal relation. When they are construed as nominal groups, the cause and the effect are not negotiable at all.