Question

grammar: subject verb agreement
subject - verb agreement means the subject and predicate in a sentence must agree in number.

• subject: who or what the sentence is about
• predicate: what the subject is doing (action)

singular
subject - does not end in \-s\
verb - ends in \-s\
plural
subject - ends in \-s\
verb - does not end in \-s\
multiple singular subjects
\and\ - plural verb form
\or\ - verb should agree with the nearest subject
exceptions:

• collective nouns: words that act as a singular noun while representing a group
• indefinite pronouns: pronouns that do not explicitly denote a number of subjects
• some singular subjects end in the word s but are not plural. (e.g. \politics\)

which sentence has correct subject - verb agreement?
dialogue change the structure of a play.
themes changes the meaning of a story.
settings change throughout the story.

Explanation:

• For "Dialogue change the structure of a play": "Dialogue" is a singular subject (it doesn't end in -s). According to the rules, a singular subject should have a verb that ends in -s. But "change" doesn't end in -s. So this sentence has incorrect subject - verb agreement.
• For "Themes changes the meaning of a story": "Themes" is a plural subject (ends in -s). A plural subject should have a verb that doesn't end in -s. But "changes" ends in -s. So this sentence has incorrect subject - verb agreement.
• For "Settings change throughout the story": "Settings" is a plural subject (ends in -s) and "change" is a verb that doesn't end in -s. This follows the plural subject - verb agreement rule (subject ends in -s, verb doesn't end in -s).

Answer:

Settings change throughout the story.