Causative Time-Phase: Durative & Inceptive

 Halliday & Matthiessen (2014: 581):

Here the same verbs keep, start/stop, also function causatively:

(1) durative:   the ball kept rolling

(caus.)            John kept the ball rolling 

(2) inceptive:  the ball started/stopped rolling

(caus.)             John started/stopped the ball rolling