Somebody or anybody

[Rachel Adams]

Could you please explain the use of "somebody" in this sentence?

"The fire is going out." Is somebody bringing more coal?"
Why is there "somebody" not "anybody"?

"A Practical English Grammar Exercises" by A. J. Thomson and A. V. Martinet.

 

[5jj]

Does this help? -

Michael Lewis [The English Verb, (1986), Hove: LTP] wrote:

“Both some and any are used with indefinite reference.
Some is used if the idea is restricted or limited in some way.
Any is used if the idea is unrestricted or unlimited.
Any applies to all or none; some applies to part.

The restriction may be a real one – There’s some cheese in the fridge – or a psychological one, existing only in the mind of the speaker – Would you like something to eat?

The real semantic distinction is as simple as that, and applies to all uses of some and any.”

Lewis could have added, "and to all words beginning with some or any - ~one, ~body, ~thing, ..."

 

[Rachel Adams]

Lewis could have added, "and to all words beginning with some or any - ~one, ~body, ~thing, ..."

Yes, I was going to ask if the same rules applies to this example.