Principal Criteria For Distinguishing Process Types

Halliday & Matthiessen (2014: 354):

Table 5-45 sets out the principal criteria for distinguishing the types of process discussed in the present chapter, taking account of 

1. the number and kind of participants, 
2. the directionality and voice, 
3. the pro-verb, 
4. the form of the unmarked present tense, and 
5. the phonological properties of the verb.