Semantic roles of the subject:
Agent John built a birdhouse.
Instrument The key opened the safe.
Experiencer Margaret felt some pain.
Empty It is hot.
Cataphoric It bothered me that my daughter lied.
Cataprhoric pronoun refers to sth that comes after, anaphoric refers back to an item: Natalie bought a new car. It is red.
Locative Seattle is foggy.
Temporal Weekends are relaxing.
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