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==== personal and relative pronouns and prepositional phrases ====
* ex., "''of which''", "''of whom''" v. "''of them''"
** the preposition "of" creates a relationship
** the personal pronoun "them" is the object of a preposition:
*** ''The players took off their jerseys, and only two '''of them''' were dirty''
*** ''Most of the jerseys used by the players were clean, but two '''of them''' were dirty''
**** "two" = the subject
**** "of them" = prepositional phrase, with "them" the object of the preposition
***** "them" refers to "jerseys"
** the relative pronouns, "that", which" or "who" create a relative clause and acts as the subject of that clause:
*** "''The players took off their jerseys, '''which''' were almost all perfectly clean''"
**** "which" = the subject of the relative clause
**** "which" refers to "jerseys"
*** "''The game was one by five players, of whom we are most proud''
**** "we" = subject of the relative clause
**** "of whom" = prepositional phrase (adverbial as it modifies "are")
**** "whom" refers to "the players"