Do Do?

[Cooklava]

What do ice-cream sellers do in the winter?

Is one do the main verb and the other an auxiliary verb?


Ice-cream sellers do do what in the winter?


Also:

The worst winter storm in a decade devastates the north.

Should the N in north be capitalized?

Thank you very much.

[Soup]

[1] What do ice-cream sellers do in the winter?

Auxiliary: do
Main Verb: do

[2] Ice-cream sellers do do what in the winter?
[3] Ice-cream sellers do what in the winter?

[4] The worst winter storm in a decade devastates the north.