I am a newbie at this forum. Recently I found a sentence exactly as below:
On the bottom of the MetroCard are three arrows and little white letters that say "Insert this way/This side facing you."
This sentence is correct, but I do not understand why.
I thought an object of preposition can never be a subject. The object of preposition in the sentence is on the bottom of the MetroCard.
I thought if we add "there" just after the object of preposition above, the sentence would be correct.
May I know some grammar rules regarding this?