mu'e is an event abstractor with the place structure x1 is a point event of (the bridi). A point event is an event that is considered a single point in time, devoid of internal structure.
pu'u is an event abstractor with the place structure: x1 is a process of (the bridi) with stages x2. A process is defined as an event having a beginning, an internal structure and an end.
za'i is the event abstractor with the place structure: x1 is a continuous state of (the bridi) being true. A state is defined as an event that has sharply defined natural boundaries dividing when the state exists and when it doesn't.
zu'o is an event abstractor with the place structure: x1 is an activity of (the bridi) consisting of repeated actions x2. An activity is defined as an event that is considered extended in time and is cyclic or repetitive.