TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.
PROBLEM: Sentence 1: Chatterbox will give the Rev. Sentence 2: Chatterbox should be given to the Rev.

SOLUTION: no

PROBLEM: Sentence 1: They were justifiably concerned, advocates say. Sentence 2: The concern was quite normal due to the case.

SOLUTION: no

PROBLEM: Sentence 1: Unfortunately, no positive proof has ever corroborated the claim. Sentence 2: The claimant provided proof to back up his statement.

SOLUTION:
yes