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:
Hi, Ted. There are four people in my family. We will go to BeiJing. There are many interesting places in it. Such as, Tian'an men Square and the Palace Museum , Beijing Roast Duck.

Corrected essay:
Hi, Ted. There are four people in my family. We will go to Beijing. There are many interesting things in it, such as Tian'anmen Square, the Palace Museum and Beijing Roast Duck.

Error analysis:
error_sentence: We will go to BeiJing.
correct_sentence: We will go to Beijing.
error: BeiJing
correction: Beijing
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English place name writing rules, the noun 〈BeiJing〉 representing a city should maintain the standard form with the first letter capitalized and the subsequent letters lowercase; therefore, it is modified to 『Beijing』 to comply with English proper noun writing rules.
error_sentence: There are many interesting places in it.
correct_sentence: There are many interesting things in it, such as Tian'anmen Square, the Palace Museum and Beijing Roast Duck.
error: places
correction: things
error_type: Noun Error
error_severity: 3
error_description: Noun Error: According to the context, 〈Beijing Roast Duck〉 refers to food, not a place, while the noun 〈places〉 denotes locations. The context requires expressing a broad range of interests, including places, food, etc. Therefore, replacing 〈places〉 with 『things』 more accurately summarizes the subsequently listed items of different categories.
error_sentence: There are many interesting places in it. Such as, Tian'an men Square and the Palace Museum , Beijing Roast Duck.
correct_sentence: There are many interesting things in it, such as Tian'anmen Square, the Palace Museum and Beijing Roast Duck.
error: . Such as, Tian'an men Square and
correction: , such as Tian'anmen Square,
error_type: Punctuation Error
error_severity: 5
error_description: ① Punctuation Error: According to English grammar rules, when 'such as' introduces examples, it should be connected to the main clause with a comma, not start a new sentence; therefore, 〈. Such as〉 is changed to 『, such as』; ② Case Error: The proper noun 〈Tian'an men〉 should not contain a space and needs to be changed to 『Tian'anmen』 to conform to standard writing; ③ Punctuation Error: According to English grammar rules, when connecting three or more parallel elements, 'and' is generally placed between the last two elements. The sentence contains three parallel elements, and 〈Tian'an men Square〉 and 〈the Palace Museum〉 are the first and second elements, so 〈and〉 is not needed between them; a comma should be used instead. Therefore, 〈and〉 is changed to 『,』 to comply with English grammar rules.
error_sentence: Such as, Tian'an men Square and the Palace Museum , Beijing Roast Duck.
correct_sentence: There are many interesting things in it, such as Tian'anmen Square, the Palace Museum and Beijing Roast Duck.
error: ,
correction: and
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: According to English grammar rules, when connecting three or more parallel elements in a sentence, 'and' is generally added between the last two elements to maintain sentence coherence and completeness; therefore, the last two elements 〈the Palace Museum , Beijing Roast Duck〉 are modified to 『the Palace Museum and Beijing Roast Duck』 to conform to English expression habits.