Prepositional Phrases Clarified
Subject never resides in prepositional phrase, EXCEPT when quantity is expressed.
Source: MGMAT, e-GMAT
According to the author of http://www.chompchomp.com/terms/prepositionalphrase.htm
, whose content you've referred to as well (is this a correct sentence
)Remember that a prepositional phrase will never contain the subject of a sentence.
Now The box of nails, which is black in color, is kept on the table.
Isn't the subject, 'The box of nails' ?
Actually the subject is the box just preceding the prepositional phrase, but here the box is "the box of nails" only. So no ambiguity.