Question: If "Mark told Pete many lies about himself, which Pete included in his book. He should have been more skeptical.", can we conclude that "Mark should have been more skeptical."?
Answer: no

Question: If "The dog chased the cat, which ran up a tree. It waited at the top.", can we conclude that "The dog waited at the top."?
Answer: no

Question: If "Look! There is a shark swimming right below that duck! It had better get away to safety fast!", can we conclude that "The duck had better get away to safety fast!"?
Answer:
yes