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How do I use tag questions with indefinite pronouns?

For example:

Nobody came to the party, did ___?

Everybody likes him, doesn't / don't ___?

Somebody should stop her, shouldn't ____?

I would enormously appreciate your help on this.

Thanks
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They/them/their/etc are common and long-standing informal 3rd person genderless singular personal pronouns/adjectives.
Comments  
I'd use 'they'. Does anybody else want to comment?
Students: We have free audio pronunciation exercises.
Nobody came to the party, did they?
Everybody likes him, don't they?
Somebody should stop her, shouldn't they?

these are the answer for these qustions. but I can't explain these. If any one can explain pleases explain it.
Thank you
Rocky BD
 Mister Micawber's reply was promoted to an answer.
(I am not sure but I think it is correct I am not a native speaker) in the tag questions with indefinite pronouns :

(every body/one -- somebody/one -- nobody/one) ------------------------> they
nothing -----------------------------------------------------------------------------------> it

by the way be careful of the negative concept that nothing and nobody make and you must use the tag with positive concept .
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Guest ___?

they

1-they?

2- they ?

3- they