I got used to your being here.
1. How would this sentence be parsed?
A simple declarative statement (sentence) in which:
I: the subject
got: main verb
used: adjective, characterizing the subject ‘I’
to: preposition, joining the noun phrase ‘your being here’ to the adjective ‘used’
your being here: noun phrase, object of the sentence
here: as an adjective (not adverb), modifying the gerund ‘being’. It’sused here for emphasis; as an adverb, modifying the verbal aspect of the gerund.
2. Is 'used to' a prepositional verb? See 1. above.
3. How does 'here', which is an adverb, modify 'being', which is a gerund (noun)? See 1. above.
4. What if 'your' was replaced with 'you', would the object of 'to' be a fused participle of you and being? You can’t. It would become ungrammatical as ‘being’ is a gerund (verbal noun), it must be preceded by the possessive form of the pronoun ‘your’ and not ‘you’.
(I) subject (got used to) idiomatic verbial phrase (your being there) what? direct object
(getting used to) = process of becoming acquainted with or accepting
I am getting used to this weather.
I got used to having chicken every night.
I'll never get used to this humidity.
I got used to the new teacher within a week