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'm a Emily. I have a familty. This ia also my best friend. This is my father. He is a fisherman. This is my mom. She is a businesswoman. This is my little. He is a studen. .

Corrected essay:
I'm Emily. I have a family. This is also my best friend. This is my father. He is a fisherman. This is my mom. She is a businesswoman. This is my little brother. He is a student.

Error analysis:
error_sentence: I'm a Emily.
correct_sentence: I'm Emily.
error: a
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English grammar rules, proper nouns used directly as predicative complements do not require any determiners. In the original sentence, 〈Emily〉 is a proper noun, but it is preceded by the article 〈a〉, which is redundant. 〈a〉 should be deleted, changing 〈a Emily〉 to 『Emily』 to make the sentence conform to English usage.

error_sentence: I have a familty.
correct_sentence: I have a family.
error: familty
correction: family
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: Based on the sentence's meaning, the intention is to express 'I have a family', thus 〈familty〉 is a misspelling of 『family』. It needs to be corrected to 『family』 for the sentence to make sense.

error_sentence: This ia also my best friend.
correct_sentence: This is also my best friend.
error: ia
correction: is
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: Based on the sentence's meaning, the intention is to express 'This is also my best friend', thus 〈ia〉 is a misspelling of 『is』. 〈ia〉 needs to be changed to the correct verb form 『is』 to maintain subject-verb agreement (this is) and ensure the sentence is grammatically correct and semantically coherent.

error_sentence: This is my little.
correct_sentence: This is my little brother.
correction: brother
error_type: Sentence Structure Error
error_severity: 3
error_description: Sentence Structure Error: According to English grammar rules, the adjective 〈little〉 in a predicative complement cannot be used alone to describe a person; it must be followed by a noun to form a complete noun phrase. The original sentence 〈This is my little.〉 is incomplete in meaning, lacking the necessary noun to specify the identity of the family member being described. Adding 『brother』 forms 'my little brother', clearly expressing 'my little brother', making the sentence complete and clear in meaning.

error_sentence: He is a studen. .
correct_sentence: He is a student.
error: studen.
correction: student
error_type: Punctuation Error
error_severity: 2
error_description: ① Spelling Error: Based on the sentence's meaning, the intention is to express 'He is a student', thus 〈studen〉 is a misspelling of 『student』. 〈studen〉 needs to be corrected to the proper spelling 『student』 for clarity and standard spelling; ② Punctuation Error: The original sentence contains two periods, indicating redundant punctuation. The extra period 〈.〉 should be deleted, leaving only one period to conform to standard English punctuation usage.