Choose the sentence that uses the correct question tag:

The correct answer is Option (1) → I’m not needed at the shop this Sunday, am I?

Question tag after “I’m not”:

“I’m not” is short for “I am not”. The sentence is negative, so the tag is positive. The tag repeats “am” with “I”: “am I”.

Why the Other Options are Incorrect?

Option 2: There were too many guests at the housewarming, weren’t they? — Incorrect. A sentence that begins with “There were” keeps “there” in the tag, not “they”.
Corrected: There were too many guests at the housewarming, weren’t there?

Option 3: Our village used to have a weekly cattle fair, wasn’t it? — Incorrect. “Used to” has no helping verb with it, so the tag uses “did”, not “was”.
Corrected: Our village used to have a weekly cattle fair, didn’t it?

Option 4: My uncle and aunt are visiting us this weekend, aren’t we? — Incorrect. The tag uses the pronoun for the subject. “My uncle and aunt” are two other people, so the pronoun is “they”.
Corrected: My uncle and aunt are visiting us this weekend, aren’t they?