Rewrite this sentence so that it is in reverse subject-verb order.
The parade marches down the street.
Down the street the parade marches.
Marching down the street is the parade.
The street the parade marches down.
The parade down the street marches.
The correct answer is "Marching down the street is the parade".
This is correct because it's not inverted in sentence 1. Sentence 3 is grammatically incorrect and nonsensical, while the 4th sentence is not inverted.
