TASK DEFINITION: Indicate all the pronouns (they, them, you, he, his, her, you, it, etc.) present in the given sentence. If there are multiple such pronouns in a sentence, then list them in the order of their first appearance in the given sentence. If a pronoun appears multiple times in a sentence, list it only once.
PROBLEM: sid explained his theory to mark but he couldn't convince him.

SOLUTION: his, he, him

PROBLEM: i used an old rag to clean the knife, and then i put it in the trash.

SOLUTION: i, it

PROBLEM: there is a pillar between me and the stage, and i can't see it .

SOLUTION:
me, i, it