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:
My name is Lin Chen. I am a 12 years old girl. There are three people in my family. My father is driver, and my mother is a doctor. I like summer holiday very much, because I can wear beautiful clothes. This summer holiday, I am going to Beijing with my parents. We plan to visit the Palace Museum. We will go to Tian'anen Square. We will eat Beijing roast Duck. It is very delicious. China is very beautiful . Come to Beijing and join us! What a wonderful holiday it will be!

Corrected essay:
My name is Lin Chen. I am a 12-year-old girl. There are three people in my family. My father is a driver, and my mother is a doctor. I like summer holidays very much because I can wear beautiful clothes. This summer holiday, I am going to Beijing with my parents. We plan to visit the Palace Museum. We will go to Tian'anmen Square. We will eat Beijing Roast Duck. It is very delicious. China is very beautiful. Come to Beijing and join us! What a wonderful holiday it will be!

Error analysis:
error_sentence: I am a 12 years old girl.
correct_sentence: I am a 12-year-old girl.
error: years
correction: -year-
error_type: Adjective Error
error_severity: 3
error_description: Adjective Error: According to English writing conventions, when a compound adjective is used as a pre-modifier, 〈years〉 should be changed to its singular form and connected with hyphens; therefore, 〈12 years old〉 is modified to 『12-year-old』.
error_sentence: My father is driver, and my mother is a doctor.
correct_sentence: My father is a driver, and my mother is a doctor.
correction: a
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English grammar rules, the singular countable noun 〈driver〉 requires the indefinite article 『a』 before it to indicate a general profession. Therefore, 『a』 needs to be added within 〈is driver〉 to make the sentence grammatically correct.
error_sentence: I like summer holiday very much, because I can wear beautiful clothes.
correct_sentence: I like summer holidays very much because I can wear beautiful clothes.
error: holiday
correction: holidays
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: When 〈summer holiday〉 refers to holidays in general, the plural form is required. Therefore, 〈holiday〉 is changed to 『holidays』 to conform to common English usage.
error_sentence: I like summer holiday very much, because I can wear beautiful clothes.
correct_sentence: I like summer holidays very much because I can wear beautiful clothes.
error: ,
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: When using the subordinate conjunction 'because' to connect a main clause and a subordinate clause, if the subordinate clause follows the main clause (main clause first, subordinate clause second), a comma is usually not needed before 'because'; the 〈,〉 should be removed to maintain sentence fluency.
error_sentence: We will go to Tian'anen Square.
correct_sentence: We will go to Tian'anmen Square.
error: Tian'anen
correction: Tian'anmen
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English writing conventions, the proper noun 〈Tian'anmen Square〉 is misspelled; 〈Tian'anen〉 needs to be corrected to 『Tian'anmen』 to match the standard English transliteration.
error_sentence: We will eat Beijing roast Duck.
correct_sentence: We will eat Beijing Roast Duck.
error: roast
correction: Roast
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English writing conventions, when the dish name ”Beijing Roast Duck” is used as a proper noun, the first letter of each word should be capitalized. Therefore, 〈roast〉 is changed to 『Roast』 to conform to English capitalization rules for titles/proper nouns.