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, we had a picnic in a park. The weather was good in the morning. We could hear birds singing inthe trees. In the afternoon, It started to tain. I didn'tt bring an umbrella and got wet. atahe I felt cold and hada headache. After that, my frieds took me to a hospital. The doctor said I had a fever. He gave me some medicine and told have a good rest at home,

Corrected essay:
Last Sunday, we had a picnic in a park. The weather was good in the morning. We could hear birds singing in the trees. In the afternoon, it started to rain. I didn't bring an umbrella and got wet. I felt cold and had a headache. After that, my friends took me to a hospital. 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: We could hear birds singing inthe trees.
correct_sentence: We could hear birds singing in the trees.
error: inthe
correction: in the
error_type: Space Error
error_severity: 1
error_description: Space Error: According to English writing conventions, the prepositional phrase 〈inthe〉 is missing a necessary space; therefore, the joined form 〈inthe〉 is corrected to the separated form 『in the』 to meet standard format requirements.
error_sentence: In the afternoon, It started to tain.
correct_sentence: In the afternoon, it started to rain.
error: It
correction: it
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English grammar rules, the word 〈It〉, not being at the beginning of the sentence, should not be capitalized; therefore, the capitalized pronoun 〈It〉 is changed to the lowercase form 『it』 to comply with intra-sentence capitalization rules.
error_sentence: In the afternoon, It started to tain.
correct_sentence: In the afternoon, it started to rain.
error: tain
correction: rain
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the sentence meaning and English vocabulary norms, the verb 〈tain〉 is a spelling error; it should express the meaning 'to rain', so the incorrect spelling 〈tain〉 is corrected to the proper verb form 『rain』 to ensure semantic accuracy.
error_sentence: I didn'tt bring an umbrella and got wet.
correct_sentence: I didn't bring an umbrella and got wet.
error: didn'tt
correction: didn't
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English contraction rules, the negative contraction 〈didn'tt〉 contains a redundant letter 't'; therefore, it is corrected to the standard negative contraction form 『didn't』 to comply with grammatical norms.
error_sentence: atahe I felt cold and hada headache.
correct_sentence: I didn't bring an umbrella and got wet. I felt cold and had a headache.
error: atahe
error_type: Other Error
error_severity: 1
error_description: Other Error: According to contextual logic and English expression norms, the irrelevant character combination 〈atahe〉 disrupts sentence coherence; therefore, this invalid character combination is deleted to allow for natural connection between the preceding and succeeding text.
error_sentence: atahe I felt cold and hada headache.
correct_sentence: I felt cold and had a headache.
error: hada
correction: had a
error_type: Space Error
error_severity: 1
error_description: Space Error: According to English writing conventions, the word combination 〈hada〉 has a missing space issue; it should actually be a combination of an auxiliary verb and an article, so it is corrected to the separated form 『had a』 to ensure correct grammatical structure.
error_sentence: After that, my frieds took me to a hospital.
correct_sentence: After that, my friends took me to a hospital.
error: frieds
correction: friends
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English vocabulary norms, the noun 〈frieds〉 is a spelling error; it should actually express the plural meaning of 'friend', so the incorrect spelling 〈frieds〉 is corrected to the proper noun form 『friends』 to ensure semantic accuracy and correct plural form.
error_sentence: He gave me some medicine and told have a good rest at home,
correct_sentence: He gave me some medicine and told me to have a good rest at home.
correction: me to
error_type: Sentence Structure Error
error_severity: 4
error_description: ① Sentence Structure Error: The transitive verb 〈told〉 lacks a necessary object, resulting in a sentence structure error; the object 『me』 needs to be added to satisfy the grammatical requirements of the transitive verb; ② Nonfinite Verb Form Error: According to infinitive usage rules, the verb 〈told〉 when introducing indirect speech requires an infinitive; therefore, the infinitive marker 『to』 and the base verb 『have』 are added, resulting in the complete structure 『told me to have』 to conform to the 'verb + object + infinitive' grammatical framework.
error_sentence: He gave me some medicine and told have a good rest at home,
correct_sentence: He gave me some medicine and told me to have a good rest at home.
error: ,
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English sentence structure rules, the end punctuation mark 〈,〉 indicates an incomplete pause, whereas the current context requires a full stop to mark the end of a declarative sentence; therefore, the comma 〈,〉 is corrected to a period 『.』 to comply with sentence-ending punctuation norms.