At Romeo and Juliet's costume party, every one of the Montagues ...

[Garrulous]

At Romeo and Juliet's costume party, every one of the Montagues and
  Capulets want to win first prize.
 
  Correct any subject-verb agreement errors in the following sentences. Do nothing
  if the sentence is correct.

Question 2

He says that the platoon of marines have enough water to complete the
  hike.
 
  Correct any subject-verb agreement errors in the following sentences. Do nothing
  if the sentence is correct.

[cici]

Answer to Question 1

At Romeo and Juliet's costume party, every one of the Montagues and Capulets
wants to win first prize.

Answer to Question 2

He says the platoon of marines has enough water to complete the hike.

[Garrulous]

Excellent

[fatboyy09]

Thanks for the timely response, appreciate it