In the following sentence what is the function of "from across"?
Professionals from across the country are coming to London.
I think it functions as a preposition but I'm not sure.
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"from across the country" means " from every part of the country. The preposition across normally describes movement from one side to the other: The children ran across the street without looking. But it can describe slightly different movements. A totally different use can be found in: A TV series known across five continents. Here across means "in every part of" all five continents.
Occasionally you find "doubled" prepositions, often with "from": from under, from behind
One can explain such double prepositions by inserting an omitted word or word group:
Surprisingly, across the country is the phrase serving whole as an adverb! Said that, across goes with the country and not with from. Of course, to answer you... from is a preposition.
across the country (adverb) - Extending throughout an entire nation