Anchor: A man is speaking a presentation while others watch a slide show.
Entailed: A man is speaking a presentation while others watch the slide show.
Contradiction: A cat is fighting another cat over food.
Contradiction: My date was very easy going.
Contradiction: It looks like a crab. 
Contradiction: The people are meeting on the moon.
Contradiction: An extracurricular activity would offer more things to do.