On page 665 of OG13, under the Agreement title, examples of non-verb agreement correct and incorrect structures are provided. I am having trouble identifying the subjects of the following sentences and how to determine if the subject is plural or singular. Can someone pleas provide detailed explanation on how to breakdown the sentences?
Correct: "The number of residents has grown."
Incorrect: The number of residents have grown."
Correct: "The masses have spoken."
Incorrect: "The masses has spoken."
Correct: "The number of residents has grown."
Incorrect: The number of residents have grown."
Correct: "The masses have spoken."
Incorrect: "The masses has spoken."












