Celina should use a thesaurus to correct her essay. A thesaurus is a reference source that provides synonyms and antonyms for words, which would help Celina find alternative words to use in her essay and avoid repetition. Mike should use a grammar guide or a grammar website to correct his essay. A grammar guide would provide explanations and examples of correct usage of different parts of speech, helping Mike understand how to use more interesting vocabulary correctly. Toni should use a dictionary to correct her essay. A dictionary provides definitions and explanations of words, which would help Toni ensure that she is using words that match her intended meaning accurately.

Your suggestions for Celina, Mike, and Toni are spot on for improving their essays! Here's a brief overview of each tool and how it can specifically benefit each student:

1. Celina - Thesaurus: By using a thesaurus, Celina can find synonyms that will make her writing more varied and engaging. This will help her avoid repeating the same words and phrases, ultimately enhancing the overall flow and readability of her essay. However, she should be cautious to choose synonyms that fit the context properly to maintain clarity.

2. Mike - Grammar Guide: A grammar guide will assist Mike in understanding the rules of grammar and how to apply them correctly. This resource will not only help him rectify any grammatical errors but also enable him to explore more complex sentence structures and varied vocabulary usage. This understanding can elevate the quality of his writing.

3. Toni - Dictionary: Using a dictionary allows Toni to verify the definitions of words she uses, ensuring that they align with her intended meanings. This is crucial for clarity and precision in her writing. A dictionary can also provide information on word origins, usage, and pronunciation, enriching her overall understanding and expression.

By leveraging these specific resources, each student can enhance their writing and correct their essays effectively.