Let's watch some videos to check how to use question tags:
Video 1: Mike and Molly TV Series
Context: Molly and her sister (Victoria) are having an argument because Victoria has brought an unknown guy home. Meanwhile, Mike is sitting in the sofa next to the unknown guy listening to the argument coming from the kitchen.
Molly: You don't know anything about this guy. For all you know he could be a serial killer!
Victoria: Serial killers don’t offer to clean your windshield and tell you you’re hot!!
Molly: Yes!!! Yes they do!!!!
Mike: You’re not a serial killer, are you?
Unknown guy: Nop.
Video 2: The Finder TV Series
Context: Isabel and Leo are two cops who are waiting for something. Isabel doesn’t know what is the situation about.
Isabel: Why am I here, Leo?
Leo: Because I saw a win-win opportunity for all of us.
Isabel: I’m gonna need my gun, aren’t I?
Video 3: Rob TV Series
Context: Rob has recently married to Hector's niece Maggie. They're in the family's living room and Hector is trying to make Rob confess a little secret.
Hector: Tell Hector!
Rob: I'm not gonna tell you anything!!
Hector: I'm your best friend here!.... Aren't I?
Rob: God, that's right!
And finally... my favourite video!!
Can you transcribe what they are saying? Come on!! Try!!