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 had a picnic with my friends in a park. In the morning, the weather was very sunny and we could hear birds singing in the trees. In the afternnon, it was started to rain. I didn't bring umbrella and I got wet. I felt very cold and headache. My friends took me to a hospital, the doctor said I had fever. He gave me some medicines and told me to have

Corrected essay:
Last Sunday, I had a picnic with my friends in a park. In the morning, the weather was very sunny and we could hear birds singing in the trees. In the afternoon, it started to rain. I didn't bring an umbrella and I got wet. I felt very cold and had a headache. My friends took me to a hospital, and the doctor said I had a fever. He gave me some medicine and told me to have a good rest at home.

Error analysis:
error_sentence: In the afternnon, it was started to rain.
correct_sentence: In the afternoon, it started to rain.
error: afternnon
correction: afternoon
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English word formation rules, the time noun 〈afternnon〉 has a letter combination error; the correct spelling should follow the compound structure 'after + noon'. The repeated 〈nn〉 needs to be corrected to the double letter 〈oo〉, and the extra letter 〈n〉 removed, finally adjusting to the standard spelling form 『afternoon』 to express the meaning of 'afternoon', conforming to the common writing standard for this time noun.
error_sentence: In the afternnon, it was started to rain.
correct_sentence: In the afternoon, it started to rain.
error: was
error_type: Verb Voice Error
error_severity: 3
error_description: Verb Voice Error: According to the semantic logic rules of English verbs, when the verb 〈start〉 is used to describe something happening spontaneously, the active voice should be used to express its inherent property. The original sentence 〈was started〉 incorrectly adds the passive voice auxiliary verb 〈was〉, leading to semantic contradiction. The redundant auxiliary verb should be deleted, and the passive structure 〈was started〉 corrected to the active form 『started』 to conform to the idiomatic expression pattern.
error_sentence: I didn't bring umbrella and I got wet.
correct_sentence: I didn't bring an umbrella and I got wet.
correction: an
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to the usage rules for singular countable nouns in English, when the singular countable noun 〈umbrella〉 starts with a vowel sound, the indefinite article 『an』 must be added to form a determiner structure. Therefore, the article 『an』 needs to be added before 〈umbrella〉 to form the complete noun phrase 『an umbrella』, while satisfying the pronunciation coordination rule of 'vowel-starting noun + an'.
error_sentence: I felt very cold and headache.
correct_sentence: I felt very cold and had a headache.
correction: had a
error_type: Verb Choice Error
error_severity: 4
error_description: ① Verb Choice Error: According to basic English sentence structure, 〈headache〉 as a symptom cannot independently serve as a predicate component. The action verb 『had』 needs to be added to form a complete 'subject + verb + object' sentence structure, correcting the noun phrase 〈headache〉 to the verb phrase 『had a headache』 to achieve grammatical completeness; ② Determiner Error: According to the English expression conventions for medical symptoms, when the countable noun 〈headache〉 indicates a single occurrence, it must be paired with the indefinite article 『a』 to form the fixed phrase 『a headache』 to ensure expressive completeness.
error_sentence: My friends took me to a hospital, the doctor said I had fever.
correct_sentence: My friends took me to a hospital, and the doctor said I had a fever.
correction: and
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: According to English compound sentence writing standards, a logical connector is missing between the two complete independent clauses 〈My friends took me to a hospital〉 and 〈the doctor said I had fever〉. The coordinating conjunction 『and』 needs to be added, retaining the comma 〈,〉 to form a standard compound structure, modifying it to 『My friends took me to a hospital, and the doctor said...』 to maintain sentence structural coherence.
error_sentence: My friends took me to a hospital, the doctor said I had fever.
correct_sentence: My friends took me to a hospital, and the doctor said I had a fever.
correction: a
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to the English expression conventions for medical symptoms, when the countable noun 〈fever〉 indicates a single occurrence, it must be paired with the indefinite article 『a』 to form the fixed phrase 『had a fever』 to ensure expressive completeness.
error_sentence: He gave me some medicines and told me to have
correct_sentence: He gave me some medicine and told me to have a good rest at home.
error: medicines
correction: medicine
error_type: Noun Number Error
error_severity: 2
error_description: Noun Number Error: According to the usage standards for English medical terminology, when 'medicine' refers to medication in a general sense (not specific countable items like pills/doses), it should follow the rules for uncountable nouns. The plural form 〈medicines〉 needs to be changed to the uncountable form 『medicine』 to comply with grammatical rules.
error_sentence: He gave me some medicines and told me to have
correct_sentence: He gave me some medicine and told me to have a good rest at home.
correction: a good rest at home.
error_type: Sentence Structure Error
error_severity: 3
error_description: Sentence Structure Error: According to the usage rules for English verb phrases, 〈told me to have〉 as a transitive verb phrase requires a complete object component, and based on the sentence meaning, the specific state and location of the rest need to be added. Therefore, the object 『a good rest』 should be added after the original phrase to clarify the object of the action, and the adverbial phrase of place 『at home』 should be added to fully express the meaning, finally modifying it to 『told me to have a good rest at home』.