The sentence that would correct Vito's sentence to fit the rules of writing about literature is, Madame Loisel suffers so much paying for the necklace over 10 years that she looks much older than her actual age.
Because Each sentence consists of rules that is a subject and a predicate, or verb clause. Nouns and verbs both have a number, and that number must match. You must use the plural form of your verb when your topic is plural. The solitary verb form is necessary for a single subject.
And the given sentence Madame Loisel suffered so much paying for the necklace over 10 years that she looked much older than her actual age. This was incorrect as the use of verb and the use of plural form were incorrect, so the correct sentence would be Madame Loisel suffers so much paying for the necklace over 10 years that she looks much older than her actual age.
And the basic rules of writing are that subject-verb agreement refers to some of the most fundamental and significant principles of English grammar the sentences, which state that a single subject must have a singular predicate (and a plural subject must have a plural predicate).
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