Problem: The sun was covered by a thick cloud all morning, but luckily, by the time the picnic started, *it* was out.
Are "it" and "The sun" the same?
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Answer: yes


Problem: As Andrea in the crop duster passed over Susan , *she* could see the landing strip.
Are "she" and "Andrea" the same?
****
Answer: yes


Problem: Sid explained his theory to Mark but *he* couldn't convince him.
Are "he" and "Sid" the same?
****
Answer:
yes