Problem: If "We went to the lake, because a shark had been seen at the ocean beach, so it was a dangerous place to swim.", does it follow that "The ocean beach was a dangerous place to swim."?

Answer: yes

Problem: If "This morning, Joey built a sand castle on the beach, and put a toy flag in the highest tower, but this afternoon the tide knocked it down.", does it follow that "This afternoon the tide knocked The flag down."?

Answer: no

Problem: If "The man couldn't lift his son because he was so heavy.", does it follow that "The man was so heavy."?

Answer: no

Problem: If "Jane knocked on the door, and Susan answered it. She invited her to come out.", does it follow that "Jane invited her to come out."?

Answer:
yes