Which type of error is present in the sentence: The group of students are studying hard?

The sentence "The group of students are studying hard" contains a subject-verb agreement error. In this case, "group" is a collective noun that represents a single entity or unit. Therefore, it should be paired with a singular verb. The correct form would be "The group of students is studying hard."

Understanding subject-verb agreement is essential in ensuring that sentences are grammatically correct, allowing for clear communication of ideas. Collective nouns can sometimes be tricky, as they refer to multiple individuals but are treated as a single unit when determining verb form. Recognizing this type of error helps in producing precise and accurate writing.