Transitivity system 1)material process:process of doing --the participants in this process include "Actor'"(动作者)and"Goal"(目标) "Actor"is obligatory and "Goal"is optional. e.g.The lion caught the tourist. The lion sprang. 他打破了窗子Transitivity system 1) material process: process of doing. --the participants in this process include "Actor"(动作者) and "Goal"(目标). "Actor" is obligatory and "Goal" is optional. e.g. The lion caught the tourist. The lion sprang. 他打破了窗子