To verify if your identified errors in the paragraph are correct, let's briefly go over each type of error and how to spot them:
1. Subject-verb agreement: This error occurs when the subject and verb in a sentence do not match in terms of singular or plural form. For example, if a singular subject is paired with a plural verb or vice versa. To identify subject-verb agreement errors, look for inconsistencies in number between the subject and the verb.
2. Parallelism: Parallelism refers to using the same grammatical structure or form for equivalent items in a sentence. It helps maintain balance and clarity. Look for lists, series, or comparisons within a sentence, and check that their elements are structured in a similar way.
3. Pronoun-antecedent agreement: This error happens when a pronoun does not agree in number, gender, or person with its antecedent. An antecedent is the word or phrase to which the pronoun refers. To identify pronoun-antecedent agreement errors, ensure that the pronouns match their antecedents in terms of number and gender.
Now, let's review the paragraph you mentioned:
"In paragraph 1 in Swimming strokes, I found 2 errors in subject-verb agreement, 1 error in parallelism, and 0 errors in pronoun-antecedent agreement."
Based on your analysis, you claim that there are two instances of subject-verb agreement errors and one instance of parallelism error. Since you did not identify any pronoun-antecedent agreement errors, the provided information aligns with your finding.
Therefore, according to your count, there are 2 errors in subject-verb agreement, 1 error in parallelism, and 0 errors in pronoun-antecedent agreement in the given paragraph.