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 with my friends. But in the afternoon, the weather were rain. And I forgot bring umbrella, so we were get wet. I felt cold and headache. Then I went to hospital with my friends. The doctor saw I was have a fever. Finaly, he gave me smoe medicine.

Corrected essay:
Last Sunday, I went to a picnic with my friends. But in the afternoon, the weather was rainy. And I forgot to bring an umbrella, so we got wet. I felt cold and had a headache. Then I went to the hospital with my friends. The doctor said I had a fever. Finally, he gave me some medicine.

Error analysis:
error_sentence: Last Sunday, I went to picnic with my friends.
correct_sentence: Last Sunday, I went to a picnic with my friends.
correction: a
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to English countable noun usage rules, the singular countable noun 〈picnic〉 must be used with an article when used independently in a sentence. Since it means 'a picnic' here, it should follow the basic structure 'indefinite article + a/an + singular countable noun'. Considering 〈picnic〉 starts with a consonant sound, the indefinite article 『a』 should be added to form a complete noun phrase.

error_sentence: But in the afternoon, the weather were rain.
correct_sentence: But in the afternoon, the weather was rainy.
error: were rain
correction: was rainy
error_type: PoS Confusion Error
error_severity: 5
error_description: ① Subject-Verb Agreement Error: According to English grammar rules, the subject 〈weather〉 is an uncountable noun and always requires a singular verb. The original sentence uses the plural verb 〈were〉, violating the subject-verb agreement principle; it should be replaced with the singular verb 『was』. Therefore, 〈The weather were〉 is changed to 『The weather was』 to maintain number consistency; ② PoS Confusion Error: According to sentence component analysis, an adjective is needed in the predicative position to describe the subject's state. The original sentence uses the noun 〈rain〉, which does not meet the grammatical requirement for a predicate; it should be changed to the adjective 『rainy』 to correctly modify 〈weather〉. Therefore, 〈rain〉 is changed to 『rainy』, ultimately forming the standard expression 『The weather was rainy』.

error_sentence: And I forgot bring umbrella, so we were get wet.
correct_sentence: And I forgot to bring an umbrella, so we 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 collocation rules, when 〈forgot〉 is used as the main verb, the following action needs an infinitive structure to mean 'forgot to do something'. The original sentence lacks the infinitive marker 〈to〉, resulting in an incomplete nonfinite verb structure. Therefore, the infinitive marker 『to』 should be added before 〈bring〉, changing 〈forgot bring〉 to 『forgot to bring』; ② Determiner Error: According to English noun usage rules, the singular countable noun 〈umbrella〉 must be used with an article when used independently in a sentence. Since it refers to a general instance here and the word starts with a vowel sound, the indefinite article 『an』 is needed to form a complete noun phrase. Therefore, 〈umbrella〉 is changed to 『an umbrella』, ultimately forming the correct expression 『forgot to bring an umbrella』.

error_sentence: And I forgot bring umbrella, so we were get wet.
correct_sentence: And I forgot to bring an umbrella, so we got wet.
error: were get
correction: got
error_type: Verb Voice Error
error_severity: 3
error_description: Verb Voice Error: According to the sentence meaning, this is not a passive meaning, but an active description of a past state. Therefore, the incorrect combination 〈were get〉 is changed to the active voice past tense verb 『got』, making the sentence 『We got wet.』 conform to the grammatical requirements of subject 〈we〉 and the past tense.

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 conventions for expressing states, the stative verb 〈have〉 should be used to describe physical conditions, not the sensory verb 〈feel〉. The original phrase 〈cold and headache〉 lacks a predicate verb; based on the meaning, 『had』 should be added to indicate the 'state of having', so the missing verb structure is corrected to 『had』 to comply with state description norms; ② Determiner Error: According to English rules for using singular countable nouns, 〈headache〉, as a countable noun appearing alone, must be accompanied by a determiner. Since it refers generally to 'a type of headache symptom' here, the indefinite article 『a』 needs to be added to form 『a headache』. Ultimately, the incorrect phrase 〈cold and headache〉 is corrected to 『cold and had a headache』.

error_sentence: Then I went to hospital with my friends.
correct_sentence: Then I went to the hospital with my friends.
correction: the
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to English definite article usage rules, when the noun 〈hospital〉 is used in the fixed phrase meaning 'going for medical treatment', the definite article 『the』 must be used to form the structure 『go to the hospital』. The original phrase 〈to hospital〉 lacks the necessary article. Therefore, according to standard English grammar rules, the prepositional phrase 〈to hospital〉 is changed to 『to the hospital』, complying with the grammatical requirement of pairing the definite article with specific places.

error_sentence: The doctor saw I was have a fever.
correct_sentence: The doctor said I had a fever.
error: saw I was have
correction: said I had
error_type: Verb Choice Error
error_severity: 4
error_description: ① Verb Choice Error: According to the semantic norms of medical scenarios, the verb 〈saw〉 usually indicates 'visual observation', whereas here it needs to express the speech act of a 'doctor's diagnostic statement'. Therefore, the visual verb 〈saw〉 is corrected to the speech verb 『said』, so that 『the doctor said』 accurately reflects the verbal communication nature of a medical diagnosis; ② Verb Voice Error: According to English tense formation rules, 〈was have〉 incorrectly uses a passive voice structure. Based on the convention for expressing a patient's temperature status, the active voice simple past tense 『had』 should be used. Therefore, the grammatically incorrect 〈was have〉 is corrected to 『had』, ultimately changing it to 『I had a fever』.

error_sentence: Finaly, he gave me smoe medicine.
correct_sentence: Finally, he gave me some medicine.
error: Finaly
correction: Finally
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English adverb formation rules, 〈Finaly〉 contains a spelling error; the correct form should be the adverb 『Finally』. When formed by adding the suffix '-ly' to the adjective 'final', the double 'l' from the root must be retained to mean 'eventually', conforming to English word formation norms.

error_sentence: Finaly, he gave me smoe medicine.
correct_sentence: Finally, he gave me some medicine.
error: smoe
correction: some
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English vocabulary spelling rules, 〈smoe〉 is an error in letter order; the correct form should be the indefinite pronoun 『some』. The word needs to follow the basic spelling structure 'consonant + vowel + consonant + e', so the incorrectly spelled 〈smoe〉 must be adjusted to the correct order 『some』, meaning 'a few' or 'a certain amount', to conform to basic English vocabulary spelling norms.