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 picnic in the park with my friends. In the afternoon it was rain. I forgot bring umbrella, so I got wet. I feeled cold and headacth. Friend bringed me to hospital, doctor thinked I had a fever. He gave some medicine and let me went home to had a good sheep.

Corrected essay:
Last Sunday I went on a picnic in the park with my friends. In the afternoon it was rainy. I forgot to bring an umbrella, so I got wet. I felt cold and had a headache. My friend brought me to the hospital, and the doctor thought I had a fever. He gave me some medicine and let me go home to have a good sleep.

Error analysis:
error_sentence: Last sunday I went to picnic in the park with my friends.
correct_sentence: Last Sunday I went on a picnic in the park with my friends.
error: sunday
correction: Sunday
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English proper noun writing conventions, names of days of the week are fixed proper nouns and require capitalization of the first letter. The original word 〈sunday〉 does not have its first letter capitalized, so it is corrected to the standard form 『Sunday』 to comply with English grammar rules.
error_sentence: Last sunday I went to picnic in the park with my friends.
correct_sentence: Last Sunday I went on a picnic in the park with my friends.
error: to
correction: on a
error_type: Preposition Error
error_severity: 4
error_description: ① Preposition Error: According to English fixed phrase conventions, 'go for a picnic' should use the preposition 〈on〉 instead of 〈to〉, so the incorrect phrase 〈to picnic〉 is corrected to the proper phrase 『on a picnic』; ② Determiner Error: According to English countable noun rules, the singular noun 〈picnic〉 requires the indefinite article 『a』 for general reference, so the determiner is added to form the complete phrase 『on a picnic』 to comply with grammatical standards.
error_sentence: In the afternoon it was rain.
correct_sentence: In the afternoon it was rainy.
error: rain
correction: rainy
error_type: PoS Confusion Error
error_severity: 2
error_description: PoS Confusion Error: According to English grammar rules for copular structures, the linking verb 〈was〉 should be followed by an adjective predicate to form a subject-copula-predicate structure. The original sentence uses the noun 〈rain〉, which does not meet the grammatical requirements, so it is changed to the adjective form 『rainy』 to complete the sentence structure.
error_sentence: I forgot bring umbrella, so I got wet.
correct_sentence: I forgot to bring an umbrella, so I got wet.
error: bring
correction: to bring an
error_type: Nonfinite Verb Form Error
error_severity: 4
error_description: ① Nonfinite Verb Form Error: According to English verb usage rules, when 〈forgot〉 means 'forgot to do something', it should be followed by a to-infinitive structure, so the missing 〈to〉 is added to form the complete infinitive phrase 『to bring』; ② Determiner Error: According to countable singular noun usage rules, 〈umbrella〉, as a singular noun starting with a vowel sound, requires the indefinite article 『an』 for determination, finally corrected to 『an umbrella』 to meet grammatical requirements.
error_sentence: I feeled cold and headacth.
correct_sentence: I felt cold and had a headache.
error: feeled
correction: felt
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English irregular verb conjugation rules, the past tense form of 〈feel〉 should be 『felt』, not 〈feeled〉, so the misspelled 〈feeled〉 is corrected to the proper past tense spelling 『felt』.
error_sentence: I feeled cold and headacth. Friend bringed me to hospital, doctor thinked I had a fever.
correct_sentence: I felt cold and had a headache. My friend brought me to the hospital, and the doctor thought I had a fever.
error: headacth. Friend bringed
correction: had a headache. My friend brought
error_type: Verb Choice Error
error_severity: 5
error_description: ① Verb Choice Error: According to English fixed collocations, 〈I feeled cold and headacth〉 has a grammatical structure problem; the adjective 〈cold〉 and the noun 〈headacth〉 cannot be directly coordinated as complements of 'feel'. The verb 'have' should be used to connect the symptom description, and the predicate verb adjusted to the simple past tense 『had』, modified to 『I felt cold and had a headache』 to conform to English expression habits; ② Determiner Error: According to English morphological rules, the phrase for 'headache' is 'have a headache', the noun 'headache' needs to be modified by the indefinite article 'a', so it needs to be changed to 『had a headache』 here; ③ Spelling Error: According to English medical terminology spelling standards, 〈headacth〉 is an incorrect spelling; the correct noun should be 『headache』 (headache), needing correction to 『had a headache』 to accurately express the symptom; ④ Pronoun Error: According to English personal reference rules, when using 〈Friend〉 alone as the subject, the possessive pronoun 『My』 must be added to clarify the relationship, thus modified to 『My friend』 to ensure clarity of meaning; ⑤ Spelling Error: Based on the English irregular verb table, the past tense of 〈bring〉 should be 『brought』, not the incorrect form 〈bringed〉, hence the verb phrase is corrected to 『My friend brought』 to comply with grammatical standards.
error_sentence: Friend bringed me to hospital, doctor thinked I had a fever.
correct_sentence: My friend brought me to the hospital, and the doctor thought I had a fever.
correction: the
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to English grammar rules, when a specific place like 〈hospital〉 is referred to as a clearly indicated public place, the definite article 『the』 is required for specific reference, thus corrected to 『brought me to the hospital』, complying with English definite article usage norms.
error_sentence: Friend bringed me to hospital, doctor thinked I had a fever.
correct_sentence: My friend brought me to the hospital, and the doctor thought I had a fever.
error: doctor thinked
correction: and the doctor thought
error_type: Conjunction Error
error_severity: 5
error_description: ① Conjunction Error: According to English coordinate sentence structure rules, a conjunction is needed to connect two independent clauses; the original sentence lacks the conjunction 〈and〉, which should be added as 『…and…』 to ensure sentence coherence, complying with English compound sentence writing standards; ② Determiner Error: According to English article usage rules, the occupational noun 〈doctor〉 requires the definite article 〈the〉 when specifically referred to, thus corrected to 『the doctor』, to meet the grammatical requirement for definite articles referring to specific objects; ③ Spelling Error: According to English verb past tense formation rules, 〈thinked〉 is an incorrect spelling; the past tense of the verb 〈think〉 is the irregular form 〈thought〉, thus corrected to 『thought』 to ensure correct tense.
error_sentence: He gave some medicine and let me went home to had a good sheep.
correct_sentence: He gave me some medicine and let me go home to have a good sleep.
correction: me
error_type: Pronoun Error
error_severity: 2
error_description: Pronoun Error: According to English transitive verb usage rules, the verb 〈gave〉, as a ditransitive verb (taking both a direct and an indirect object), must clearly express the recipient of the action. The original sentence lacks the indirect object, so 『me』 needs to be added after 〈gave〉 as the object of the action, with the complete structure being 『gave me…』, to comply with English ditransitive sentence syntax standards.
error_sentence: He gave some medicine and let me went home to had a good sheep.
correct_sentence: He gave me some medicine and let me go home to have a good sleep.
error: went
correction: go
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to the usage rules of the English causative verb 〈let〉, it must be followed by a bare infinitive (verb base form without 'to'). The original sentence uses the past tense 〈went〉, which does not conform to grammatical standards, and should be corrected to the base form 『go』, forming the correct structure 『let me go』, to meet the grammatical requirements for causative verbs.
error_sentence: He gave some medicine and let me went home to had a good sheep.
correct_sentence: He gave me some medicine and let me go home to have a good sleep.
error: had
correction: have
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to the grammatical rules for using infinitives as adverbs of purpose in English, the verb 〈had〉 should use the to-infinitive structure. The original sentence mistakenly uses the past tense 〈had〉; it should be corrected to 『to have』, forming the standard adverbial structure of purpose 『…to have…』, to comply with purpose expression norms.
error_sentence: He gave some medicine and let me went home to had a good sheep.
correct_sentence: He gave me some medicine and let me go home to have a good sleep.
error: sheep
correction: sleep
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: Based on contextual semantic analysis, the word 〈sheep〉 (sheep) does not fit the contextual meaning requirement; the concept of 'sleep' should actually be expressed. According to English vocabulary spelling rules, the correct noun form is 『sleep』, therefore the noun 〈sheep〉 is corrected to 『sleep』 to ensure semantic accuracy and part-of-speech matching.