1. As the days go by, Mary-Anne never learned her lesson.
2. I bought a pocketbook, and a chessboard.
In Sentence 1, we add a comma because a name is coming up.
In Sentence 2, we add a comma because there is a compound word.
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Explained is the action verb.
The activity director is completing the action of explaining the context rules.
The answer is 3. '8 and 9' only provide evidence. The rest of the passage after sentence 3 provides evidence how man is distinguished from animals.
