Question:
Sentence 1: "Sid explained his theory to Mark but he couldn't understand him."
Sentence 2: "Mark couldn't understand him."
Is sentence 2 true, based on sentence 1?

ANS:
yes

Question:
Sentence 1: "I put the heavy book on the table and it broke."
Sentence 2: "The table broke."
Is sentence 2 true, based on sentence 1?

ANS:
yes

Question:
Sentence 1: "Pete envies Martin although he is very successful."
Sentence 2: "Martin is very successful."
Is sentence 2 true, based on sentence 1?

ANS:
no

Question:
Sentence 1: "The scientists are studying three species of fish that have recently been found living in the Indian Ocean. They appeared two years ago."
Sentence 2: "The scientists appeared two years ago."
Is sentence 2 true, based on sentence 1?
ANS:
no