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 a10 years-old girl. There are three people in my family. My father is a driver, and my mother is a doctor. I like summer holiday very much, because I can wear beeutiful 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 beutiful. Come to Beijing and jion us! What a wonderful holiday it will be! Welcome to China. Have a good day!

Corrected essay:
My name is Lin Chen. I am a 10-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! Welcome to China. Have a good day!

Error analysis:
error_sentence: I am a10 years-old girl.
correct_sentence: I am a 10-year-old girl.
error: a10 years
correction: a 10-year
error_type: Spelling Error
error_severity: 3
error_description: ① Space Error: According to English writing conventions, the determiner 〈a〉 and the number 〈10〉 are separate words and must be separated by a space. The original sentence lacks the necessary space; a space needs to be inserted between 〈a〉 and 〈10〉 to form the correct expression 『a 10』; ② Spelling Error: According to English word formation rules, an age expression used as a pre-modifier must be hyphenated and the noun must be in singular form. The incorrect structure 〈10 years-old〉 should be changed to the grammatically correct compound adjective 『10-year-old』, ultimately correcting it to the complete noun phrase 『a 10-year-old girl』 to conform to English expression habits.
error_sentence: I like summer holiday very much, because I can wear beeutiful 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: 2
error_description: Noun Number Error: According to English noun usage rules, when 〈summer holiday〉 is used as a countable noun to express a general sense (not referring to a specific holiday), the plural form must be used. Therefore, the singular noun 〈holiday〉 should be changed to the plural form 『holidays』, forming the correct expression 『summer holidays』, to meet grammatical requirements.
error_sentence: I like summer holiday very much, because I can wear beeutiful clothes.
correct_sentence: I like summer holidays very much, because I can wear beautiful clothes.
error: beeutiful
correction: beautiful
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English spelling conventions, the adjective 〈beeutiful〉 has incorrect letter order; the correct spelling should be 『beautiful』 'pretty'. Pay special attention to the letter combination rules of this word to ensure the word conforms to standard spelling rules.
error_sentence: China is very beutiful.
correct_sentence: China is very beautiful.
error: beutiful
correction: beautiful
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English spelling conventions, the adjective 〈beeutiful〉 has incorrect letter order; the correct spelling should be 『beautiful』 'pretty'. Pay special attention to the letter combination rules of this word to ensure the word conforms to standard spelling rules.
error_sentence: Come to Beijing and jion us!
correct_sentence: Come to Beijing and join us!
error: jion
correction: join
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English spelling conventions, the verb 〈jion〉 has incorrect letter order; the correct spelling should be 『join』 'join'. Pay special attention to the letter combination rules of this word to ensure the word conforms to standard spelling rules.