In the PMB we use three classes of roles: Event Roles, Concept Roles, and Time Roles. The first character of a role name is always in uppercase, the following ones in lowercase. The event roles coincide with those of VerbNet except where indicated. An event role instantation Participant(E,X) can be paraphrased as "E has Participant X", or "X is the Participant (of E)".

Event RoleExplanation
Agent(E,X)X is an Actor in an event E who initiates and carries out the event intentionally or consciously, and X exists independently of the event.
Asset(E,X)E has Value X that is a concrete object.
Attribute(E,X)X is an Undergoer that is a property of an entity or entities, as opposed to the entity itself.
Beneficiary(E,X)X is an Undergoer in a state or an event E that is (potentially) advantaged or disadvantaged by E.
Causer(E,X)X is an Actor (animate or inanimate) in an event that initiates the event, but that does not act with any intentionality or consciousness; it exists independently of the event.
Co-Agent(E,X)Agent who is acting in coordination or reciprocally with another agent while participating in the same event (specific to events with symmetrical participants).
Co-Patient(E,X)Patient that participates in an event with another patient, both participate equally in the event (specific to events with symmetrical participants).
Co-Theme(E,X)Theme that participates in an event or state with another Theme; both participate equally (thereby distinguishing this role from Pivot; specific toevents with symmetrical participants).
Destination(E,X)Event E has Goal X that is a concrete, physical location.
Duration(E,X)Event E has length or extent of time X.
Experiencer(E,X)X is a Patient that is aware of the event E undergone (specific to events of perception).
Finish(E,X)Time that indicates when an event ends or a state becomes false. (VerbNet: Final-Time)
Frequency(E,X)X is the number of occurrences of an event E within a given time span.
Goal(E,X)Place that is the end point of an action and exists independently of the event.
Instrument(E,X)Undergoer in an event that is manipulated by an Agent, and with which an intentional act is performed; it exists independently of the event
Location(E,X)Place that is concrete.
Manner(E,X)The way an event is taking place. (not in VerbNet)
Material(E,X)Patient that exists at the starting point of action (inheritance from Source), which is transformed through the event into a new entity; concrete or abstract.
Patient(E,X)Undergoer in an event that experiences a change of state, location or condition, that is causally involved or directly affected by other participants, and exists independently of the event.
Pivot(E,X)Theme that participates in an event with another theme unequally. Pivot is much more central to the event (thereby distinguishing it from Co-Theme).
Product(E,X)Result that is a concrete object.
Recipient(E,X)Destination that is animate.
Result(E,X)Goal that comes into existence through the event.
Source(E,X)Place that is the starting point of action; exists independently of the event.
Start(E,X)Time that indicates when an event begins or a state becomes true.
Stimulus(E,X)Causer in an event that elicits an emotional or psychological response (specific to events of perception.
Theme(E,X)Undergoer that is central to an event or state that does not have control over the way the event occurs, is not structurally changed by the event, and/or is characterized as being in a certain position or condition throughout the state.
Time(E,X)Participant that indicates an instant or an interval of time during which a state exists or an event took place.
Topic(E,X)Theme characterized by information content transferred to another participant (specific to events of communication).
Value(E,X)X is a Place along a formal scale.

Concept Role Explanation
Colour(X,Y) Entity X (an entity) has colour Y.
Creator(X,Y) Entity X (an artifact or situation) has creator Y (animate).
MadeOf(X,Y) Entity X is made of material Y.
Name(X,Y) Entity X has name Y (usually a constant)
Of(X,Y) (used only in combination with a predicate of a relational noun).
Owner(X,Y) Entity X has owner Y (animate).
PartOf(X,Y) Entity X is (body) part of Y.
Quantity(X,Y)Entity X has quantity Y (usually a number).
Role(X,Y) Entity X plays role Y.
Title(X,Y) Entity X has title Y.
Unit(X,Y) Entity X is measured in unit of measurement Y.
User(X,Y) Entity X has user Y.

Time RoleExplanation
ClockTime(T, hh:mm) Specifies exact clock time of a time interval.
DayOfMonth(T, dd) Specifies exact day in a month.
DayOfWeek(T, X) Specifies exact day in a week.
Decade(T, yyy0) Specifies decade in a time interval.
MonthOfYear(X,Y) Specifies month in a year.
YearOfCentury(T, yyyy) Specifies a calendar year.