semantic role ( vai trò ngữ nghĩa) : the part played by a noun phrase, such as agent, in the event described by the sentence
EX:
Agent and Theme
Instrument and Experiencer
Location, Source and Goal
agent: the semantic role of the noun phrase identifying the one who performs the action of the verb in an event
EX: The boy kicked the ball => the boy is agent
theme: the semantic role of the noun phrase used to identify the entity involved in or affected by the action of the verb in an event
EX: The boy kicked the ball => the ball is theme
instrument: the semantic role of the noun phrase identifying the entity that is used to perform the action of the verb
EX: The boy cut the rope with a razor => a razor is instrument
experiencer: the semantic role of the noun phrase identifying the entity that has the feeling, perception or state described by the verb
EX: The boy feels sad => The boy is experiencer
Location: the semantic role of the noun phrase identifying where an entity is
(e.g. The boy is sitting in the classroom) => classroom is location
Source: the semantic role of the noun phrase identifying where an entity moves from
(e.g. The boy ran from the house) => th house is source
Goal: the semantic role of the noun phrase identifying where an entity moves to
(e.g. The boy walked to the window) => window is goal