Anchor: A teenager in a blue shirt is skateboarding past a Blockbuster video.
Entailed: A teen is skateboarding.
Contradiction: a teen is riding a bike.
Contradiction: We do not need any more parents to supervise. 
Contradiction: Two men are playing instruments.
Contradiction: A trash bag is bought by the woman.
Contradiction: On Tuesday night I talked to the doctor, and on Wednesday the radiologist told me to call an orthopedist.