Martin (1992: 232):
The aspectual continuity markers are illustrated below. Inceptives (e.g. already, finally and at last) are opposed to continuatives (e.g. still); and inceptives are divided into those signalling that something has begun sooner than expected (already) and those coding that it has begun later than expected (finally and at last).
FRUITION:PRECEDENCE[4:173] Is Ben coming?— He's already here.
FRUITION:ENDURANCE[4:174] Has Ben shown up?— He's finally arrived.
CONTINUATION[4:175] Has Ben left?— No, he's still here.
 In SFL theory, these "aspectual continuity markers" are mood Adjuncts of temporality. They function interpersonally, not logically.
 In SFL theory, the mood Adjuncts already and still differ in terms of expectation with regard to the interpersonal time at issue (see Halliday & Matthiessen 2004: 127-8).
 The terms inceptive and durative — not continuative — relate to the elaboration of processes in terms of phase (see Halliday & Matthiessen 2004: 499-501).
 The mood Adjuncts already, finally and at last are concerned with expectation with regard to interpersonal time, not the beginning phase of processes.
 In SFL theory, the textual cohesion (substitution & ellipsis) is marked here by the mood Adjunct of polarity no (see Halliday & Matthiessen 2004: 564). In Martin's model, the logical relation of continuity is marked here by the continuative still (which in SFL theory is an interpersonal Adjunct).