Answer:
there's no sentence ,I can't solve it because there's no sentence
The singular noun is 'grass'. Eyes are plural, and the words see and green are not nouns. I hope I helped! :)
Edited passage (corrections are in bold, everything else is fine):
Considered one of the most significant documents in the history of the democracy, the Magna Carta was written by thirteenth-century barons to protect their rights against King John of England. During the American Revolution, the document inspired the colonists in their pursuit of freedom.
Hope I was able to help! Feel free to leave a comment if you have any further questions :)
