Jenna has absolutely astounded me with her grasp of Grammar.  With no prior discussion of anything remotely resembling a noun, verb, or preposition, I started her in a seventh grade textbook, Easy Grammar.

The first thing Easy Grammar does is teaches the student all common prepositions (just over 50) and has them memorize these.  Once memorized, the student attacks all sentences by crossing out prepositional phrases.  With few exceptions, Jenna can spot a prepositional phrase a mile away.  Occasionally she'll stop at an adjective and miss the object of the preposition.  For example, John crawled under the red car and scrambled out the other side.   She'll occasionally cross out 'under the red' and miss the fact that red isn't a noun but since she hasn't studied adjectives, this does not surprise me.  What does surprise me is the fact that she won't miss the compound verb crawled and scrambled.  The kid is a whiz.

At any given time you can find her curled in a corner, on the couch, or sitting at the table with her book.  Odd sounds of, 'they did go', 'Tom ate and drank', 'coach and team cheered' echo through the room as she reduces each sentence in her workbook to its lowest common denominator.  And people say grammar is nothing like math!