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 plan to go to Beijing on holiday. First, I'm going to Tian'anmen Square. I think there will be many people in here. Next, I want to have some delicious special. Like Beijing Roast Duck. Finally, I will go to the Palace Museum and the Great Wall. They are both big. I want to here early. I will have fun on holiday. Do you come with me?

Corrected essay:
I plan to go to Beijing on holiday. First, I'm going to Tian'anmen Square. I think there will be many people there. Next, I want to have some delicious specials, like Beijing Roast Duck. Finally, I will go to the Palace Museum and the Great Wall. They are both famous. I want to be there early. I will have fun on holiday. Do you come with me?

Error analysis:
error_sentence: I think there will be many people in here.
correct_sentence: I think there will be many people there.
error: in here
correction: there
error_type: Adverb Error
error_severity: 3
error_description: Adverb Error: 〈here〉 refers to the speaker's current location, but the context describes the yet-to-be-reached 〈Tian'anmen Square〉; therefore, 『there』 should be used as the adverb of place, changing 〈in here〉 to 『there』.
error_sentence: Next, I want to have some delicious special. Like Beijing Roast Duck.
correct_sentence: Next, I want to have some delicious specials, like Beijing Roast Duck.
error: special. Like
correction: specials, like
error_type: Noun Number Error
error_severity: 4
error_description: ① Noun Number Error: When used as a noun, 〈special〉 means a specialty or special dish, but in this context, the plural form 〈specials〉 should be used to indicate more than one special dish; ② Punctuation Error: As an example phrase, 〈Like Beijing Roast Duck〉 should be connected to the main clause with a comma, not form a separate sentence; therefore, 〈. Like〉 is corrected to 『, like』.
error_sentence: They are both big.
correct_sentence: They are both famous.
error: big
correction: famous
error_type: Adjective Error
error_severity: 3
error_description: Adjective Error: The adjective 〈big〉 does not accurately describe the characteristics of Tian'anmen Square and the Great Wall in the sentence; the adjective 〈famous〉 should be used to emphasize their renown. Therefore, 〈big〉 is changed to 『famous』 to fit the semantic requirement.
error_sentence: I want to here early.
correct_sentence: I want to be there early.
error: here
correction: be there
error_type: Nonfinite Verb Form Error
error_severity: 4
error_description: ① Nonfinite Verb Form Error: According to English usage, 'want to do' means 'wish to do something'. The sentence expresses the desire to arrive there early and should use the 'want to do' structure; a verb is missing here; ② Preposition Error: 〈here〉 does not fit the expression of location in this context; 〈there〉 should be used to refer to Beijing. Therefore, 〈here〉 is changed to 『be there』.