Question

nobody left him a tip,________?(tag question)​

Answer 1

$\huge \boxed{\mathfrak{Question} \downarrow}$

• Nobody left him a tip, ________ ? (tag question).

$\huge \boxed{\mathfrak{Answer} \downarrow}$

• Nobody left him a tip, did they ?

$\huge \boxed{\mathfrak{Explanation} \downarrow}$

• Here we used, did they because nobody is used & it's in plural form.