Writing prompt: My Good Friend

Student essay:
Liu Qing lei is my good friend,he's 12 years old,he's form China,he'Chinese.His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.

Corrected essay:
Liu Qing Lei is my good friend. He's 12 years old. He's from China. He's Chinese. His class is Class 5, Grade 1. His friend is Betty. Betty is from England. Betty is 13 years old. She is in Class 2. His teacher is Mrs. Green. Mrs. Green is from America.

Error analysis:
error_sentence: Liu Qing lei is my good friend,he's 12 years old,he's form China,he'Chinese.
correct_sentence: Liu Qing Lei is my good friend.
error: lei
correction: Lei
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English writing conventions, the first letter of the proper noun “Lei” as a surname needs to be capitalized. In the original sentence, the first letter of 〈lei〉 is not capitalized, which does not conform to the convention; it should be changed from 〈lei〉 to 『Lei』 to comply with English naming and writing rules.

error_sentence: Liu Qing lei is my good friend,he's 12 years old,he's form China,he'Chinese.
correct_sentence: Liu Qing Lei is my good friend. He's 12 years old.
error: ,he
correction: . He
error_type: Punctuation Error
error_severity: 2
error_description: ① Punctuation Error: According to English grammar rules, “Liu Qing Lei is my good friend” and “he's 12 years old” are two independent sentences and cannot be connected only by a comma; the comma should be changed to a period, i.e., change 〈,he〉 to 『. He』, to make the sentence structure correct; ② Case Error: According to English writing conventions, the first letter of the word at the beginning of a sentence needs to be capitalized; in the original sentence, “he” is at the beginning of the sentence and should be changed to the capitalized 『He』.

error_sentence: Liu Qing lei is my good friend,he's 12 years old,he's form China,he'Chinese.
correct_sentence: He's 12 years old. He's from China. He's Chinese.
error: ,he's form China,he'Chinese
correction: . He's from China. He's Chinese
error_type: Punctuation Error
error_severity: 2
error_description: ① Punctuation Error: According to English grammar rules, in the original sentence, independent sentences like “he's 12 years old”, “he's form China”, and “he'Chinese” are continuously joined by commas, which is not standard; the commas should be changed to periods to make the sentence structure clear, i.e., change the relevant commas to 『. 』; ② Spelling Error: In the original sentence, 〈form〉 is misspelled; according to English expression habits, “from” should be used as the preposition, so 〈form〉 needs to be changed to 『from』; ③ Contraction Error: In the original sentence, 〈he'〉 is an incorrect contraction form; the correct contraction should be 『He's』, so 〈he'〉 needs to be changed to 『He's』 to conform to grammatical rules.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: His class is Class 5, Grade 1. His friend is Betty.
error: Class5 Grade1.His
correction: Class 5, Grade 1. His
error_type: Space Error
error_severity: 1
error_description: ① Punctuation Error: According to English punctuation usage conventions, when indicating class and grade, “Class” and the number, and “Grade” and the number are usually separated by a comma; in the original sentence, 〈Class5 Grade1〉 should be changed to 『Class 5, Grade 1』; at the same time, sentences cannot be joined arbitrarily and need to be separated by periods; the sentence connections in the original sentence are chaotic, and periods should be used reasonably to break up sentences, making the sentence structure clear; ② Space Error: In English writing, a space is usually needed between numbers and words to distinguish different words; in the original sentence, there is a missing space between the number 〈5〉 and 〈Grade 1〉, a space should be added, changing it to 『Class 5 Grade 1』.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: His friend is Betty.
error: ,
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English grammar rules, “His friend is Betty” is an independent sentence and cannot be connected to subsequent descriptions like “Betty is form Endland” with only a comma; it needs to be separated by a period to clearly delineate the sentence structure, so 〈,〉 should be changed to 『.』.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: Betty is from England.
error: form Endland,
correction: from England.
error_type: Punctuation Error
error_severity: 2
error_description: ① Spelling Error: According to English vocabulary spelling rules, when expressing “from”, the correct preposition is 『from』; in the original sentence, 〈form〉 is misspelled and should be changed to 『from』; when referring to the country “England”, the correct spelling is 『England』; in the original sentence, 〈Endland〉 is misspelled and needs to be changed to 『England』; ② Punctuation Error: An English sentence needs to end with a period; in the original sentence, the sentence “Betty is from England” is missing a period at the end, a period 〈.〉 should be added to make the sentence conform to grammatical norms.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: Betty is 13 years old. She is in Class 2.
error: yeas old.his
correction: years old. She is
error_type: Pronoun Error
error_severity: 3
error_description: ① Spelling Error: According to English vocabulary spelling rules, the correct spelling for “year” is 『years』; in the original sentence, 〈yeas〉 is misspelled and should be changed to 『years』; ② Pronoun Error: In the original sentence, “Betty” is a female name, and the nominative pronoun 『She』 should be used to refer to a female, while 〈his〉 is a male possessive pronoun, which is used incorrectly and should be changed to 『She』; ③ Punctuation Error: In the original sentence, the sentence connections are chaotic, and periods are needed between sentences to maintain clarity of meaning; a period 〈.〉 should be added in the appropriate place to make the sentence structure conform to English expression norms.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: She is in Class 2. His teacher is Mrs. Green.
error: 2.His
correction: 2. His
error_type: Space Error
error_severity: 1
error_description: Space Error: According to English writing conventions, a space should be kept after a period before starting a new sentence. In the original sentence, there is a missing space between “2.His”; 〈2.His〉 should be changed to 『2. His』.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: His teacher is Mrs. Green. Mrs. Green is from America.
error: Mrs Green,Mrs
correction: Mrs. Green. Mrs.
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English writing conventions, the abbreviation for the title “Mrs” needs to be followed by a period to conform to writing standards; in the original sentence, 〈Mrs〉 is not followed by a period and should be changed to 『Mrs.』; “His teacher is Mrs Green” and “Mrs Green is formAmerica” are two independent sentences and cannot be connected only by a comma, they need to be separated by a period; 〈Mrs Green,Mrs〉 should be changed to 『Mrs. Green. Mrs.』 to make the sentence structure correct.

error_sentence: His class is Class5 Grade1.His friend is Betty,Betty is form Endland,Betty is 13 yeas old.his in Class 2.His teacher is Mrs Green,Mrs Green is formAmerica.
correct_sentence: Mrs. Green is from America.
error: formAmerica
correction: from America
error_type: Spelling Error
error_severity: 2
error_description: ① Spelling Error: According to English vocabulary spelling rules, when expressing “from”, the correct preposition is 『from』; in the original sentence, 〈form〉 is misspelled and should be changed to 『from』; ② Space Error: In English writing, “from” and “America” are two separate words and need to be separated by a space for distinction; in the original sentence, 〈formAmerica〉 is not separated and should be changed to 『from America』.