1. "Used" and "Accustomed" are past participles followed by a preposition, in this case "to." Prepositions are followed by a noun, a noun phrase, a pronoun, a noun clause, or a noun form of the verb – that is, the "ing" form.

2. An appositive adjective is added to its noun to explain it, like a noun in Apposition.: A noun clause may also be used in Apposition to a noun to explain its meaning.: Hence a substantive in Apposition with a nominative is in the nominative case.: A substantive in Apposition with an objective is itself in the objective case.: One word is in Apposition to another when it is placed near to it