Consider the following setup. What would the word classes of "out" and "there" be?
"Where is James?"
"He is out there somewhere, right in the middle of the storm."
I was first thinking in the direction of "to be out there" being a phrasal verb, but I know that can't be true. This leaves me to think that there
is a demonstrative pronoun (correct me if I'm wrong), but I can't figure out what the word class of "out" is in that case.
Best Answer
The words out and there are both prepositions. In this particular instance the preposition out is taking the preposition there as its complement. For a modern account of prepositions see one of the following vetted grammar sources:
Whereas before the great linguist Otto Jespersen, people had identified prepositions as a family of words that occurred before nouns, Jespersen had the insight to observe that this family was being misidentified, or rather misdescribed. He noted that words such as in, on, at, after, before, until have the same syntactic properties regardless of whether they occurred before nouns or not. In a blinding flash of what can surely only be described as common sense, he decided that these were actually always the same words. This radical idea follows on rather mundanely, but methodically, from the way that we treat other parts of speech such as nouns or verbs.
Modern grammars such as CaGEL have gone one step further than this, but this need not bother us here. One knock-on effect of realising that prepositions need not always precede nouns, is that some prepositions don't occur before nouns at all, in the same way that some verbs never take objects. Such words include items such as:
Prepositions such as out and there have various syntactic properties in common with other prepositons:
Notice that out there is a complement of BE in the OP's example. We could also have :
The preposition phrase could be used to post-modify a noun:
The whole phrase could be the complement of another preposition:
All of this shows out there to be a preposition phrase. Notice that none of the tests above will work with adverbs. You can test this yourself with an adverb like locally, for example.
Hope this is helpful!