Writing prompt: Assume you are Emily. Below is your family photo. Please introduce your family members based on the picture. Requirement: Write at least 6 sentences.

Student essay:
I am Emily. I have blond hair. My brother wear purple T-shirt. My mother wear green T-shirt . My father have brown short hair. They are small eyes and big mouth. We are family.

Corrected essay:
I am Emily. I have blond hair. My brother wears a purple T-shirt. My mother wears a green T-shirt. My father has short brown hair. They have small eyes and big mouths. We are family.

Error analysis:
error_sentence: My brother wear purple T-shirt.
correct_sentence: My brother wears a purple T-shirt.
error: wear
correction: wears a
error_type: Subject-Verb Agreement Error
error_severity: 5
error_description: ① Subject-Verb Agreement Error: According to English grammar rules, the original sentence has a subject-verb agreement error; the subject 〈My brother〉 is third-person singular, and the original predicate 〈wear〉 is in the third-person plural form, so the verb 〈wear〉 needs to be changed to the third-person singular form 『wears』 to maintain subject-verb agreement; ② Determiner Error: According to English grammar rules, a countable singular noun must be preceded by an article; the original sentence is missing the necessary determiner 『a』 before 〈T-shirt〉, so the phrase is modified to 『a purple T-shirt』 to comply with English grammar rules.

error_sentence: My mother wear green T-shirt .
correct_sentence: My mother wears a green T-shirt.
error: wear
correction: wears a
error_type: Subject-Verb Agreement Error
error_severity: 5
error_description: ① Subject-Verb Agreement Error: According to English grammar rules, the original sentence has a subject-verb agreement error; the subject 〈My mother〉 is third-person singular, and the original predicate 〈wear〉 is in the third-person plural form, so the verb 〈wear〉 needs to be changed to the third-person singular form 『wears』 to maintain subject-verb agreement; ② Determiner Error: According to English grammar rules, a countable singular noun must be preceded by an article; the original sentence is missing the necessary determiner 『a』 before 〈T-shirt〉, so the phrase is modified to 『a green T-shirt』 to comply with English grammar rules.

error_sentence: My father have brown short hair.
correct_sentence: My father has short brown hair.
error: have brown short
correction: has short brown
error_type: Word Order Error
error_severity: 5
error_description: ① Subject-Verb Agreement Error: According to English grammar rules, the original sentence has a subject-verb agreement error; the subject 〈My father〉 is third-person singular, and the original predicate 〈have〉 is in the third-person plural form, so the verb 〈have〉 needs to be changed to the third-person singular form 『has』 to maintain subject-verb agreement; ② Word Order Error: According to English expression habits, when multiple adjectives modify a noun, adjectives describing length/size should be arranged according to the “opinion-size-age-shape-color” order, therefore 〈brown short〉 needs to be changed to 『short brown』 to conform to idiomatic expression.

error_sentence: They are small eyes and big mouth.
correct_sentence: They have small eyes and big mouths.
error: are
correction: have
error_type: Verb Choice Error
error_severity: 3
error_description: Verb Choice Error: According to English expression habits, when describing possession of body parts, 『have』 should be used instead of a “be” verb, therefore 〈They are〉 in the original sentence is changed to 『They have』 to conform to semantic logic.

error_sentence: They are small eyes and big mouth.
correct_sentence: They have small eyes and big mouths.
error: mouth
correction: mouths
error_type: Noun Number Error
error_severity: 2
error_description: Noun Number Error: According to English grammar rules, 〈mouth〉 in the original sentence should be in the plural form 『mouths』 to be consistent with the subject 〈They〉, therefore 〈mouth〉 should be changed to 『mouths』 to comply with English grammar rules.