Writing prompt: Written Expression. Assume you are Lin Chen and have just made a new pen pal named Ted. Please write a letter to him describing your personal background, family situation, and your plan to visit Beijing over the summer. Writing hints: Tian'anmen Square, the Palace Museum, Beijing Roast Duck.
Dear Ted,
________
Welcome to China. Have a good day!
Yours,
Lin Chen

Student essay:
Hello Ted. I have four member in my family. My father, my mother, my sister and me. I am going to Beijing from my summer hoilday. First day, I am going to Tian'anmen Square. Second day, my family is going to the Palace Museum. Third day, I am going to eat Beijing Roast Duck. At night, we are going to go back home by plane.

Corrected essay:
Hello Ted, I have four members in my family. They are my father, my mother, my sister and me. I am going to Beijing for my summer holiday. On the first day, I am going to Tian'anmen Square. On the second day, my family is going to the Palace Museum. On the third day, I am going to eat Beijing Roast Duck. At night, we are going to go back home by plane.

Error analysis:
error_sentence: Hello Ted.
correct_sentence: Hello Ted, I have four members in my family.
error: .
correction: ,
error_type: Punctuation Error
error_severity: 1
error_description: Punctuation Error: According to English writing conventions, a comma, not a period, should follow the salutation 〈Ted〉 in an English letter to maintain proper formatting; therefore, 〈Ted.〉 is changed to 『Ted,』.
error_sentence: I have four member in my family.
correct_sentence: Hello Ted, I have four members in my family.
error: member
correction: members
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: The numeral 〈four〉 requires the plural form of a countable noun; therefore, 〈member〉 is changed to 『members』 to maintain number agreement.
error_sentence: My father, my mother, my sister and me.
correct_sentence: They are my father, my mother, my sister and me.
error: My
correction: They are my
error_type: Sentence Structure Error
error_severity: 3
error_description: Sentence Structure Error: The sentence 〈My father, my mother, my sister and me〉 lacks a subject and verb, resulting in an incomplete expression; therefore, 『They are』 is added to complete the sentence.
error_sentence: I am going to Beijing from my summer hoilday.
correct_sentence: I am going to Beijing for my summer holiday.
error: from
correction: for
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: According to English expression conventions, the preposition for is needed to indicate purpose or use; therefore, “from my summer hoilday” is changed to 『for my summer holiday』.
error_sentence: I am going to Beijing from my summer hoilday. First day, I am going to Tian'anmen Square.
correct_sentence: I am going to Beijing for my summer holiday. On the first day, I am going to Tian'anmen Square.
error: hoilday. First
correction: holiday. On the first
error_type: Preposition Error
error_severity: 3
error_description: ① Spelling Error: According to English writing conventions, 〈hoilday〉 is misspelled; its correct spelling is 『holiday』 'vacation'; ② Preposition Error: In English, to specify 'a particular day,' the structure 'On the + ordinal number + day' is used; therefore, 『On the』 is added before 'first day'.
error_sentence: Second day, my family is going to the Palace Museum.
correct_sentence: On the second day, my family is going to the Palace Museum.
error: Second
correction: On the second
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: In English, to specify 'a particular day,' the structure 'on the + ordinal number + day' is used; therefore, 'on the' is added before 〈second day〉 to conform to English writing conventions, and since it acts as an adverbial of time at the beginning of the sentence, 'on' needs to be capitalized, resulting in the change to 『On the second』.
error_sentence: Third day, I am going to eat Beijing Roast Duck.
correct_sentence: On the third day, I am going to eat Beijing Roast Duck.
error: Third
correction: On the third
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: In English, to specify 'a particular day,' the structure 'on the + ordinal number + day' is used; therefore, 'on the' is added before 〈third day〉 to conform to English writing conventions, and since it acts as an adverbial of time at the beginning of the sentence, 'on' needs to be capitalized, resulting in the change to 『On the third』.