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 m family. My father is a bank manager. My mother is a doctor. We are going to Beijing in ths summer holiday. We are going to Tianian men Squre and the Palace Museum. I want to eat Beijing Roast Duck. Come to Beijing an join us.

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 bank manager. My mother is a doctor. We are going to Beijing this summer holiday. We are going to Tian'anmen Square and the Palace Museum. I want to eat Beijing Roast Duck. Come to Beijing and join us.

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: 2
error_description: Adjective Error: According to English adjective formation rules, when 〈12 years old〉 acts as a pre-modifying adjective for a noun, it must be hyphenated and use the singular form; therefore, it needs to be corrected to 『12-year-old』 to comply with the compound adjective formation standard.
error_sentence: There are three people in m family.
correct_sentence: There are three people in my family.
error: m
correction: my
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English possessive pronoun spelling rules, 〈m〉 is a severe abbreviation error for 〈my〉; it must be fully spelled as 『my』 to correctly express the possessive meaning 'my'.
error_sentence: We are going to Beijing in ths summer holiday.
correct_sentence: We are going to Beijing this summer holiday.
error: in ths
correction: this
error_type: Preposition Error
error_severity: 3
error_description: ① Preposition Error: According to English time expression rules, 〈this summer holiday〉, as a time phrase led by a demonstrative pronoun (this + time noun), functions independently as an adverbial of time and does not require the preposition 〈in〉. Therefore, the redundant preposition 〈in〉 is deleted, using 『this summer holiday』 directly to adhere to the principle of conciseness; ② Spelling Error: 〈ths〉 is a typical prefix omission spelling error, missing the letter 'i'. According to basic vocabulary spelling rules, it should be corrected to the full spelling 『this』 to ensure the accuracy of the demonstrative pronoun.
error_sentence: We are going to Tianian men Squre and the Palace Museum.
correct_sentence: We are going to Tian'anmen Square and the Palace Museum.
error: Tianian men Squre
correction: Tian'anmen Square
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English proper noun writing conventions, 〈Tianian men Squre〉 has a missing hyphen and incorrect word order; the correct form should be 『Tian'anmen Square』 (天安门广场), requiring the addition of a hyphen and adjustment of word order to the fixed collocation of 『Tian'anmen』 and 『Square』.
error_sentence: Come to Beijing an join us.
correct_sentence: Come to Beijing and join us.
error: an
correction: and
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English writing conventions, 〈an〉 is an article, not a conjunction; here, the coordinating conjunction 『and』 is needed to correctly connect the two verb phrases 〈Come to Beijing〉 and 〈join us〉. Therefore, the misspelled 〈an〉 is corrected to 『and』 to achieve semantic coherence in the sentence.