[نبيل موريس جورج]

488 question tags (2): advanced points

use it in question tags to refer to nothing and everything.
Nothing can happen, can it?


We use they (see 528) to refer to nobody, somebody and everybody (and no one etc).
Nobody phoned, did they?
Somebody wanted a drink, didn't they? Who was it?

Practical English Usage (p.471-third edition)