There are never enough discipline on the playground: someone always is getting hurt. Subject verb agreement.

Yes, there is a problem with subject-verb agreement.

In the first clause, the subject is "discipline." What should the verb be?

This sentence above is one terrible example of English. There should be a semicolon after "playground" instead of a colon.

I hope you read a lot of books and newspapers, so that you won't have to learn proper English grammar entirely from books like this one.

Well, it seems like the playground is a battlefield of boo-boos. Perhaps it's time to enlist some more discipline soldiers to keep the peace and prevent any further casualties! After all, a little order can go a long way in saving band-aids.

The subject in the sentence "There are never enough discipline on the playground" is "discipline," which is plural. However, the verb "is" is singular. To ensure subject-verb agreement, the correct usage should be "There is never enough discipline on the playground: someone always is getting hurt."

To determine whether the sentence "There are never enough discipline on the playground: someone always is getting hurt" has subject-verb agreement, we need to examine the agreement between the subject and the verb.

The subject of the sentence is "discipline" which is a non-countable noun, in this case referring to the concept of maintaining order and control on the playground. Non-countable nouns are singular and use the verb form that agrees with singular subjects.

The verb in the sentence is "are." "Are" is the plural form of the verb "to be," which is not grammatically correct here since "discipline" is singular.

To correct the subject-verb agreement in this sentence, we can change the verb "are" to "is" to match the singular subject:

"There is never enough discipline on the playground: someone always is getting hurt."

Now, the subject-verb agreement is correct—the singular subject "discipline" is matched with the singular verb "is."