Writing prompt: Based on the given hints and referring to the picture, write a short essay.
Last Sunday, I went for a picnic in the park with my friends. It started raining in the afternoon. I forgot my umbrella and got wet. I felt cold and had a headache. My friends took me to the hospital. The doctor said I had a fever. He gave me some medicine and told me to go home and rest well.
Writing hints: picnic; rain; umbrella; get wet; hospital; fever; medicine.

Student essay:
Last Sunday, I went to a picnic in the park with my friends. In the morning, the weather was sunny. But in the afternoon the weather became rain. I forgot umbrella, I got wet. I felt cold and headache. My friends took me to the hospital. The doctor said, "You have a fever. "He gave me the medicine. He all said, "have a good rest at home. "

Corrected essay:
Last Sunday, I went to a picnic in the park with my friends. In the morning, the weather was sunny. But in the afternoon, the weather became rainy. I forgot to bring my umbrella, so I got wet. I felt cold and had a headache. My friends took me to the hospital. The doctor said, "You have a fever." He gave me some medicine. He also said, "Have a good rest at home."

Error analysis:
error_sentence: But in the afternoon the weather became rain.
correct_sentence: But in the afternoon, the weather became rainy.
correction: ,
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English rules for separating adverbials, a time adverbial 〈In the afternoon〉 at the beginning of a sentence must be separated from the main clause by a comma. Therefore, a comma 『,』 needs to be added after the time adverbial to form the standard structure 『In the afternoon,』.
error_sentence: But in the afternoon the weather became rain.
correct_sentence: But in the afternoon, the weather became rainy.
error: rain
correction: rainy
error_type: PoS Confusion Error
error_severity: 3
error_description: PoS Confusion Error: According to English grammar rules for linking verbs, 〈became〉 as a linking verb must be followed by an adjective to form a predicative. The noun 〈rain〉 in the original sentence does not meet the requirement for a predicative component, so it needs to be changed to the weather adjective 『rainy』 to form a correct linking verb structure.
error_sentence: I forgot umbrella, I got wet.
correct_sentence: I forgot to bring my umbrella, so I got wet.
correction: to bring my
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: ① Nonfinite Verb Form Error: According to English grammar rules, the verb 〈forgot〉 followed by an infinitive structure indicates an intended action that was not performed; therefore, the infinitive form 『to bring』 needs to be added to correctly express the meaning of 'forgot to do something'; ② Determiner Error: Based on the contextual reference, the common countable noun 〈umbrella〉 lacks a determiner, leading to unclear reference; therefore, the possessive pronoun 『my』 needs to be added to form 『my umbrella』 to clearly express the meaning 'I forgot to bring my own umbrella'.
error_sentence: I forgot umbrella, I got wet.
correct_sentence: I forgot to bring my umbrella, so I got wet.
correction: so
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: According to English grammar rules, a conjunction is needed to connect two independent clauses. The original sentence has a comma splice error; therefore, the conjunction 『so』 needs to be added before the second clause 〈I got wet.〉, changing it to 『, so I got wet』 to indicate the causal relationship with the previous clause and make the sentence structure conform to English syntactic norms.
error_sentence: I felt cold and headache.
correct_sentence: I felt cold and had a headache.
correction: had a
error_type: Verb Choice Error
error_severity: 4
error_description: ① Verb Choice Error: According to English grammar rules, expressing physical discomfort requires the structure 'have + symptom', paying attention to the tense of 'have'. The original sentence lacks a predicate verb to pair with the second symptom; therefore, 『had』 is added after 〈felt cold〉, changing 〈headache〉 into the complete verb-object phrase 『had a headache』; ② Determiner Error: According to English rules for countable nouns, the singular countable noun 〈headache〉 requires a determiner. Therefore, the indefinite article 『a』 is added, modifying 〈headache〉 to the grammatically correct 『a headache』 for complete and accurate expression.
error_sentence: "He gave me the medicine.
correct_sentence: He gave me some medicine.
error: the
correction: some
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to English determiner usage rules, when referring to non-specific or first-mentioned plural countable nouns/uncountable nouns, the definite article 〈the〉 would incorrectly imply that the medicine has already been specifically mentioned in the context; therefore, it is changed to 『some』 to indicate a general reference, maintaining semantic accuracy.
error_sentence: He all said, "have a good rest at home. "
correct_sentence: He also said, "Have a good rest at home."
error: all
correction: also
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: Based on contextual semantic analysis, 〈all〉 meaning 'entirely' does not fit the sentence's meaning. Here, the doctor is adding extra advice after the initial suggestion, requiring an adverb indicating addition. Therefore, the absolute scope adverb 〈all〉 is changed to the adverb 『also』, which correctly expresses the supplementary relationship, fitting the contextual logic of 'also'.
error_sentence: He all said, "have a good rest at home. "
correct_sentence: He also said, "Have a good rest at home."
error: have
correction: Have
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English writing conventions for direct quotations, the first letter of a complete sentence within quotation marks must be capitalized. The first word 〈have〉 in the direct quote in the original sentence is in lowercase, which does not comply with English punctuation rules; therefore, it is changed to the capitalized form 『Have』 to ensure correct formatting.