Writing prompt: Using the given vocabulary and referring to the picture, write a letter. Assume you are Amy. Your friend Jenny wants to travel to London and has asked for your travel advice. Please write a letter to help her, mentioning things like transportation, tourist attractions, and food. Writing hints: take a plane; visit the London Eye; the Thames; go to the museum.

Student essay:
Hollle, my name is Amy, This is my frind, Jondon. She want go to London for trip. She can take a plane. She should visit the London Eye with her parents. I think she can go to the Thames. Finally, she could go to the museum.

Corrected essay:
Hello, my name is Amy. This is my friend, Jenny. She wants to go to London for a trip. She can take a plane. She should visit the London Eye with her parents. I think she can go to the Thames. Finally, she could go to the museum.

Error analysis:
error_sentence: Hollle, my name is Amy, This is my frind, Jondon.
correct_sentence: Hello, my name is Amy.
error: Hollle
correction: Hello
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the sentence meaning, the intended expression here is 'hello', so 〈Hollle〉 is a misspelling of 『Hello』; it needs to be changed to 『Hello』 to make the sentence coherent.

error_sentence: Hollle, my name is Amy, This is my frind, Jondon.
correct_sentence: Hello, my name is Amy.
error: ,
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English grammar rules, the original sentences 〈my name is Amy〉 and 〈This is my frind, Jondon〉 are two independent clauses and should be separated by a 『.』; therefore, the 〈,〉 needs to be replaced with a 『.』 to make the sentence structure correct.

error_sentence: Hollle, my name is Amy, This is my frind, Jondon.
correct_sentence: This is my friend, Jenny.
error: frind, Jondon
correction: friend, Jenny
error_type: Spelling Error
error_severity: 4
error_description: ① Spelling Error: According to the sentence meaning, the intended expression here is 'friend', so 〈frind〉 is a misspelling of 『friend』; it needs to be changed to 『friend』 to make the sentence coherent; ② Spelling Error: According to the prompt, the intended expression here is 'Jenny', so 〈Jondon〉 is a misspelling of 『Jenny』; it needs to be changed to 『Jenny』 to make the sentence coherent.

error_sentence: She want go to London for trip.
correct_sentence: She wants to go to London for a trip.
error: want
correction: wants to
error_type: Nonfinite Verb Form Error
error_severity: 5
error_description: ① Subject-Verb Agreement Error: According to English grammar rules, there is a subject-verb agreement error in the original sentence; the subject 〈She〉 is third-person singular, while the verb 〈want〉 is in the third-person plural form; therefore, the verb 〈want〉 needs to be changed to the third-person singular form 『wants』 to maintain subject-verb agreement; ② Nonfinite Verb Form Error: According to English grammar rules, the verb 〈want〉 should be followed by an infinitive structure; therefore, 『to』 needs to be added after 〈want〉 in the original sentence to form 『wants to go』 to conform to grammatical rules.

error_sentence: She want go to London for trip.
correct_sentence: She wants to go to London for a trip.
correction: a
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English grammar rules, a singular countable noun must be preceded by an article; the original sentence lacks the necessary determiner 『a』 before 〈trip〉; therefore, the phrase should be modified to 『for a trip』 to comply with English grammar rules.