A writer would use a singular verb when the subject of the sentence is singular. Here are some examples of singular subjects that would require a singular verb:
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Nouns:
- The dog barks loudly.
- A car is parked outside.
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Pronouns:
- He runs every morning.
- She writes stories.
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Collective nouns (when considered as a single unit):
- The team wins the championship.
- The committee decides on the proposal.
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Uncountable nouns:
- Water boils at 100 degrees Celsius.
- Information is essential for making decisions.
In each of these examples, the subject is singular, which necessitates the use of a singular verb form.