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Sentence Correction: Subject Verb Agreement Questions - Overview

J. K. Rowling, in her Harry Potter books, frequently and cleverly using Latin, Latin-like and Latin-based words.

Great!

This answer choice corrects the original mistake by replacing the un-conjugated verb using, with the conjugated verb uses. The singular verb uses correctly matches the singular subject J. K. Rowling.

Incorrect.

While this answer replaces the un-conjugated verb using, with the conjugated verb use, it is still grammatically incorrect. The singular subject J. K. Rowling does not agree with the plural verb use.

Incorrect.

This sentence lacks a conjugated verb, but every sentence must have at least one. Using is not a conjugated verb.

Incorrect.

This answer choice repeats the original mistake and changes the meaning of the original sentence by changing books to book.

Incorrect.

This answer choice repeats the original grammar mistake.

This sentence does not utilize a conjugated verb; every sentence must have at least one. Using is not a conjugated verb.

books, frequently and cleverly using Latin, Latin-like, and Latin-based
volumes, frequently and cleverly use Latin, Latin-based, and Latin-like
book, frequently and cleverly using Latin, Latin-based, and Latin-like 
books, frequently and cleverly uses Latin, Latin-based, and Latin-like
series, frequently and cleverly using Latin, Latin-based, and Latin-like