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Complete the roommates' argument in the dark by selecting the right tag questions.
"You paid the power bill, _________________________? I gave you the cash for it yesterday! I am the one who usually pays it, _________________________, so it was your turn!"
The correct answers are didn't you and aren't I.
Tag questions use the auxiliary verb that matches the tense of the main sentence, but with the opposite polarity (positive sentence → negative tag).
For the past simple verb "paid," the negative tag is didn't you?
For the phrase "I am," the grammatically correct negative tag is the irregular form aren't I? (since "amn't I" is not standard English).