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, we can hear the brids singing in the trees. But in the afternoon, the weather became rainy, I didn't bring umbrella and I got wet felt very headache. Then my friends sent me to hospital, the doctor said I was fever. He was gave me some medicines and told me to have a good rest at home.

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 the birds singing in the trees. But in the afternoon, the weather became rainy. I didn't bring an umbrella and I got wet. I had a headache. Then my friends sent me to the 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: Last sunday, I had a picnic with my friends in a park.
correct_sentence: Last Sunday, I had a picnic with my friends in a park.
error: sunday
correction: Sunday
error_type: Case Error
error_severity: 1
error_description: Case Error: The day name 〈sunday〉, as a proper noun, requires capitalization of the first letter; it is not capitalized here, which is a case error, thus it is corrected to 『Sunday』 to comply with English writing conventions.

error_sentence: In the morning, the weather was very sunny, we can hear the brids singing in the trees.
correct_sentence: In the morning, the weather was very sunny, and we could hear the birds singing in the trees.
error: we can
correction: and we could
error_type: Conjunction Error
error_severity: 5
error_description: ① Conjunction Error: According to English compound sentence writing rules, the necessary coordinating conjunction is missing between the two independent clauses 〈the weather was sunny〉 and 〈we can hear...〉. The coordinating conjunction 『and』 needs to be added to form the correct structure 『the weather was sunny, and we could hear...』 to clarify the parallel relationship between the two past events; ② Verb Tense Error: According to the principle of tense consistency in context, when the main clause uses the past tense 〈was〉 to describe the weather condition, the modal verb 〈can〉 in the parallel clause should correspondingly be changed to the past tense 『could』, correcting 〈we can hear〉 to 『we could hear』, thereby maintaining the past tense consistency of the entire compound sentence.

error_sentence: In the morning, the weather was very sunny, we can hear the brids singing in the trees.
correct_sentence: In the morning, the weather was very sunny, and we could hear the birds singing in the trees.
error: brids
correction: birds
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the correct spelling rules for English animal nouns, 〈brids〉 has an error in letter order. The word refers to the biological category 'birds' in the sentence, so the incorrect spelling 〈brids〉 is corrected to the standard noun form 『birds』 by adjusting the letter order to b-i-r-d-s, making it conform to the spelling conventions of basic English vocabulary.

error_sentence: But in the afternoon, the weather became rainy, I didn't bring umbrella and I got wet felt very headache.
correct_sentence: But in the afternoon, the weather became rainy.
error: ,
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English sentence structure rules, a comma should not be used to connect two complete independent clauses 〈the weather became rainy〉 and 〈I didn't bring...〉. A period should be used here to split the compound sentence into two simple sentences, so the incorrect punctuation 〈,〉 is corrected to 『.』, forming the correct structure 『The weather became rainy. I didn't bring...』 to comply with punctuation rules regarding the separation of complete sentences in English writing.

error_sentence: But in the afternoon, the weather became rainy, I didn't bring umbrella and I got wet felt very headache.
correct_sentence: I didn't bring an umbrella and I got wet.
correction: an
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: The singular countable noun 〈umbrella〉 lacks an indefinite article before it, which is a determiner error; 『an』 needs to be added based on the initial vowel sound.

error_sentence: But in the afternoon, the weather became rainy, I didn't bring umbrella and I got wet felt very headache.
correct_sentence: I didn't bring an umbrella and I got wet. I had a headache.
error: felt very
correction: . I had a
error_type: Sentence Structure Error
error_severity: 5
error_description: ① Sentence Structure Error: According to English grammar rules, 〈I got wet felt very headache〉 is a run-on sentence error and needs to be split into two independent clauses. According to English punctuation rules, a period should be used for separation, and the subject 〈I〉 should be added to the second clause, modifying it to 『I got wet. I had a headache』; ② Verb Choice Error: According to English collocations, 〈felt〉 cannot directly modify 〈headache〉; the verb phrase 『had a headache』 should be used to express 'feeling a headache', so 〈felt very headache〉 is corrected to 『had a headache』; ③ Determiner Error: According to English grammar rules, 'headache' is a singular countable noun and requires the indefinite article 'a' to form a complete noun phrase, so 『a』 is added before 〈headache〉, finally correcting it to 『had a headache』.

error_sentence: Then my friends sent me to hospital, the doctor said I was fever.
correct_sentence: Then my friends sent me to the hospital, and the doctor said I had a fever.
correction: the
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: The noun 〈hospital〉 requires an article before it; none is added here, which is a determiner error, so 『the』 needs to be added to comply with English grammar rules, indicating a specific hospital.

error_sentence: Then my friends sent me to hospital, the doctor said I was fever.
correct_sentence: Then my friends sent me to the hospital, and the doctor said I had a fever.
correction: and
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: A conjunction is missing between the two independent clauses 〈sent me to hospital〉 and 〈the doctor said...〉, causing a lack of coherence between the statements, which is a conjunction error; therefore, 『and』 needs to be added for connection to make the statements coherent.

error_sentence: Then my friends sent me to hospital, the doctor said I was fever.
correct_sentence: Then my friends sent me to the hospital, and the doctor said I had a fever.
error: was
correction: had a
error_type: Verb Choice Error
error_severity: 3
error_description: Verb Choice Error: Expressing a state of illness requires the verb 〈have〉, not the be-verb; the original text uses the be-verb 〈was〉, which is a verb choice error, so 〈was fever〉 should be changed to 『had a fever』 to conform to English idiomatic usage.

error_sentence: He was gave me some medicines and told me to have a good rest at home.
correct_sentence: He gave me some medicine and told me to have a good rest at home.
error: was
error_type: Verb Voice Error
error_severity: 3
error_description: Verb Voice Error: Incorrect use of the passive voice 〈was gave〉; according to the sentence meaning, it should express 'gave me medicine', thus the active voice should be used. The original use of passive voice is a verb voice error; the correct form is the active voice 『gave』, deleting the redundant auxiliary verb.

error_sentence: He was gave me some medicines and told me to have a good rest at home.
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: 3
error_description: Noun Number Error: 〈medicines〉 in this context functions as an uncountable noun referring to medication in general, requiring the singular form. The plural form is used here. This is a noun number error; the plural suffix should be removed, changing it to 『medicine』 to fit the context, indicating the doctor gave some medicine.