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: john was doing research in the library when he heard a man humming and whistling. he was very annoying.

SOLUTION: he

PROBLEM: there is a gap in the wall. you can see the garden behind it .

SOLUTION:
you, it