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:
Now it is summer holiday. My father is a doctor. My mother is a nurse. I will go to the Beijing with my parents. Beijing is a perfect place. There are many famous views. Such as Tian'anmen Square, the Palace Museum . . . . . . The Tian'anmen Square is very big. There are many yummy food in it, for example, Beijing Roast Duck.

Corrected essay:
Now it is the summer holiday. My father is a doctor. My mother is a nurse. I will go to Beijing with my parents. Beijing is a perfect place. There are many famous views, such as Tian'anmen Square, the Palace Museum... Tian'anmen Square is very big. There are many yummy foods in it, for example, Beijing Roast Duck.

Error analysis:
error_sentence: Now it is summer holiday.
correct_sentence: Now it is the summer holiday.
correction: the
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English grammar rules, when referring to a specific period of time, the definite article "the" is needed before a season noun. The original sentence lacks a determiner before 〈summer holiday〉, thus there is a determiner error. 『the』 needs to be added to specifically refer to "summer holiday" to comply with grammatical rules.
error_sentence: I will go to the Beijing with my parents.
correct_sentence: I will go to Beijing with my parents.
error: the
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English grammar rules, proper nouns for city names do not require an article. Therefore, there is a determiner error here. The redundant definite article 〈the〉 needs to be deleted to comply with English grammar rules.
error_sentence: There are many famous views. Such as Tian'anmen Square, the Palace Museum . . . . . .
correct_sentence: There are many famous views, such as Tian'anmen Square, the Palace Museum...
error: . Such
correction: , such
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English syntax rules, the exemplary structure "such as" in a sentence needs to be connected to the main clause with a comma and cannot form an independent sentence. Therefore, there is a punctuation error here. 〈. Such〉 needs to be changed to 『, such』 to comply with English syntax rules.
error_sentence: Such as Tian'anmen Square, the Palace Museum . . . . . . The Tian'anmen Square is very big.
correct_sentence: There are many famous views, such as Tian'anmen Square, the Palace Museum...
error: . . . . . . The
correction: ...
error_type: Punctuation Error
error_severity: 4
error_description: ① Punctuation Error: According to English writing conventions, the ellipsis in English is different from the Chinese ellipsis and should be uniformly represented by three dots 『...』; 〈. . . . . .〉 needs to be modified to 『...』 to comply with writing conventions; ② Word Redundancy Error: According to English proper noun collocation rules, the geographical proper noun "Tian'anmen Square" does not require an article before it. Therefore, the redundant definite article 『The』 needs to be deleted to comply with collocation rules.
error_sentence: There are many yummy food in it, for example, Beijing Roast Duck.
correct_sentence: There are many yummy foods in it, for example, Beijing Roast Duck.
error: food
correction: foods
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: According to English grammar rules, the determiner "many" can only modify countable nouns in their plural form. Therefore, there is a noun number error here. 〈food〉 needs to be changed to its plural form 『foods』 to mean "many different kinds of food" to conform to the original sentence's meaning and English grammar rules.