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:
Hello! My name is Emily. This is my family's pohoto. This my father Bai Yuhao, he is tall and fat. This is my mother Xu Linxuan, she is tall and thin, she is very beautiful. This is my brother Si Chuxuan. He is smart and thin.

Corrected essay:
Hello! My name is Emily. This is my family's photo. This is my father Bai Yuhao. He is tall and fat. This is my mother Xu Linxuan. She is tall and thin, and she is very beautiful. This is my brother Si Chuxuan. He is smart and thin.

Error analysis:
error_sentence: This is my family's pohoto.
correct_sentence: This is my family's photo.
error: pohoto
correction: photo
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: Based on the sentence meaning, the intended word is 'photo'. 〈pohoto〉 is a misspelling of 『photo』 and needs to be corrected to 『photo』 for the sentence to make sense.

error_sentence: This my father Bai Yuhao, he is tall and fat.
correct_sentence: This is my father Bai Yuhao.
correction: is
error_type: Sentence Structure Error
error_severity: 4
error_description: Sentence Structure Error: According to English grammar rules, the original sentence 〈This my father Bai Yuhao〉 lacks the necessary linking verb 『is』 to form a complete subject-verb-complement structure. Therefore, it is added to form 『This is my father Bai Yuhao』 to maintain grammatical correctness.

error_sentence: This my father Bai Yuhao, he is tall and fat.
correct_sentence: This is my father Bai Yuhao. He is tall and fat.
error: , he
correction: . He
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English writing conventions, the original sentences 〈This my father Bai Yuhao〉 and 〈he is tall and fat〉 are complete clauses. A comma 〈,〉 cannot be used to separate two independent clauses. Therefore, 〈, he〉 needs to be changed to 『. He』 to conform to English writing standards.

error_sentence: This is my mother Xu Linxuan, she is tall and thin, she is very beautiful.
correct_sentence: This is my mother Xu Linxuan. She is tall and thin, and she is very beautiful.
error: , she
correction: . She
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English writing conventions, the original sentences 〈This is my mother Xu Linxuan〉 and 〈she is tall and thin〉 are complete clauses. A comma 〈,〉 cannot be used to separate two independent clauses. Therefore, 〈, she〉 needs to be changed to 『. She』 to conform to English writing standards.

error_sentence: This is my mother Xu Linxuan, she is tall and thin, she is very beautiful.
correct_sentence: She is tall and thin, and she is very beautiful.
correction: and
error_type: Conjunction Error
error_severity: 4
error_description: Conjunction Error: According to English expression habits, the clauses 〈she is tall and thin〉 and 〈she is very beautiful〉 are complete clauses. As parallel structures, they need to be connected by 『and』. Therefore, the conjunction 『and』 is added to connect them, conforming to English expression habits.