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:
I'm 13 years old boy. I live in China, Anhui. There are 5 people in my family. They are my parents, my grandparents and I. I have a plan for go to Beijing. I'm going to visit Tian'anmen Spuare and the Palace Museum. I'm also going to eat Beijing Roast Duck.

Corrected essay:
I'm a 13-year-old boy. I live in Anhui, China. There are 5 people in my family. They are my parents, my grandparents and I. I have a plan for going to Beijing. I'm going to visit Tian'anmen Square and the Palace Museum. I'm also going to eat Beijing Roast Duck.

Error analysis:
error_sentence: I'm 13 years old boy.
correct_sentence: I'm a 13-year-old boy.
error: 13 years
correction: a 13-year-
error_type: Adjective Error
error_severity: 4
error_description: ① Determiner Error: According to English noun phrase structure rules, the singular countable noun 〈boy〉 must be preceded by a determiner. Since 〈13 years old boy〉 represents a general reference and is singular, the indefinite article 『a』 needs to be added before the number 〈13〉 to form a complete noun phrase; ② Adjective Error: According to English compound adjective formation rules, when using number + noun + adjective as a pre-modifier, hyphens are needed to connect them into a single modifying unit. Therefore, the loose structure 〈13 years old〉 is modified to the grammatically correct compound adjective form 『13-year-old 』, ultimately correcting the phrase to 『a 13-year-old boy』 to satisfy both determiner rules and adjective formation rules.
error_sentence: I live in China, Anhui.
correct_sentence: I live in Anhui, China.
error: China, Anhui
correction: Anhui, China
error_type: Word Order Error
error_severity: 3
error_description: Word Order Error: According to international postal writing conventions, English address descriptions must strictly follow the spatial hierarchy order from specific to general. The original phrase 〈China, Anhui〉 incorrectly places the country 〈China〉 first, violating the progressive structure principle of English addresses. Therefore, the incorrect word order is adjusted to 『Anhui, China』 to meet the writing conventions for English addresses.
error_sentence: I have a plan for go to Beijing.
correct_sentence: I have a plan for going to Beijing.
error: go
correction: going
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English preposition usage rules, when the preposition 〈for〉 functions as a function word, its object must be a nominal structure. The base form of the verb 〈go〉 in the original sentence cannot directly serve as the object of the preposition. According to nonfinite verb usage norms, 〈go〉 needs to be changed to the gerund form 『going』 to form the grammatically correct 『for going』 structure, thus satisfying the mandatory requirements of English grammar regarding the internal structure of prepositional phrases.
error_sentence: I'm going to visit Tian'anmen Spuare and the Palace Museum.
correct_sentence: I'm going to visit Tian'anmen Square and the Palace Museum.
error: Spuare
correction: Square
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English word formation rules, the noun 〈Spuare〉 has an issue with inverted letter order; it should be corrected to the proper noun 『Square』, meaning 'plaza' or 'square', to conform to correct word spelling rules.