Halliday & Matthiessen (2014: 579-80):
In the transitive analysis we introduced the notion of an Initiator, a participant who brings about the action performed by the Actor. This function appears in the explicit causative structure with the verb make. We can then, of course, extend the agency further: Mary made John roll the ball, as in Figure 8-10:
Note that in the ergative analysis the function of Agent recurs, allowing for indefinite expansion along the lines of Fred made Mary make John ...
But there is still only one process, that of rolling; so we can still represent it as two verbal groups in hypotactic relationship. In this instance, however, they are discontinuous, as shown in Figure 8-11).
