In the double-possessive idiom, however, the object is in the possessive case after of; for example,—
There was also a book of Defoe's,... and another of Mather's.—Franklin.
See also numerous examples in Secs. 68 and 87.
Sometimes nominative.
And the prepositions but and save are found with the nominative form of the pronoun following; as,—
Nobody knows but my mate and I
Where our nest and our nestlings lie.
—BRYANT.
USES OF PREPOSITIONS.
Inseparable.
310. Prepositions are used in three ways:—
(1) Compounded with verbs, adverbs, or conjunctions; as, for example, with verbs, withdraw, understand, overlook, overtake, overflow, undergo, outstay, outnumber, overrun, overgrow, etc.; with adverbs, thereat, therein, therefrom, thereby, therewith, etc.; with conjunctions, whereat, wherein, whereon, wherethrough, whereupon, etc.