Semantic Roles
Agent
Is the entity that performs the action, in short words is a person or thing who is the doer of an event.
Example
The boy kicked the ball.
Theme
The entity is involved in or affected by the action
Example
The boy kicked the ball.
Instrument
If an agent uses another entity in order to perform an action.
Example
He drew the picture with a crayon.
Experiencer
When a noun phrase is used to designate an entity as the person who has a feeling, perception or state.
Example
Did you hear what noise?
Location
An entity is in the description of an event.
Example
The paper is in the folder.
Source
Where the entity moves from.
Example
Jessy is from Toronto.
Goal
Where the agent moves to.
Example
Johan swam to the raft.