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 my friends and I go picnic at park. But start raining in afternoon, I don't have umbella. I have get wet I'm very cold and very handache. my friends ba wo songdao le yiyuan. The dother says I have fever so give me medicine. OK!

Corrected essay:
Last Sunday, my friends and I went on a picnic at the park. But it started raining in the afternoon, and I didn't have an umbrella. I got wet and I was very cold and had a headache. My friends took me to the hospital. The doctor said I had a fever and gave me medicine. OK!

Error analysis:
error_sentence: Last sunday my friends and I go picnic at park.
correct_sentence: Last Sunday, my friends and I went on a picnic at the park.
error: sunday
correction: Sunday,
error_type: Punctuation Error
error_severity: 2
error_description: ① Case Error: According to English proper noun writing conventions, the day name 〈sunday〉 as a fixed proper noun must have its first letter capitalized; therefore, the lowercase form is corrected to the standard writing 『Sunday』; ② Punctuation Error: Based on English writing format requirements, when a time adverbial is at the beginning of a sentence, it must be separated from the main clause by a comma; therefore, the missing comma 『,』 is added, forming the standard structure 『Sunday, we...』.

error_sentence: Last sunday my friends and I go picnic at park.
correct_sentence: Last Sunday, my friends and I went on a picnic at the park.
error: go
correction: went on a
error_type: Verb Tense Error
error_severity: 5
error_description: ① Verb Tense Error: According to English grammar rules, the past tense should be used when narrating past events; the verb 〈go〉 in the original sentence is in the present simple tense, which does not match the past time context, therefore, it should be changed to the past tense 『went』 to maintain tense consistency; ② Preposition Error: According to English fixed collocations, the verb phrase 〈go picnic〉 is incomplete; the preposition 『on』 needs to be added to form the correct collocation 〈go on a picnic〉; also, according to English grammar rules, the countable noun 〈picnic〉 requires the indefinite article 『a』 before it to form a complete structure; ③ Determiner Error: According to English grammar rules, the singular countable noun 〈picnic〉 requires an article before it; since it is a general reference and not specific, the indefinite article 『a』 should be used to form the standard expression 『a picnic』.

error_sentence: Last sunday my friends and I go picnic at park.
correct_sentence: Last Sunday, my friends and I went on a picnic at the park.
correction: the
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to English grammar rules, the singular countable noun 〈park〉 must be modified by a determiner; since it refers to a specific place here, the definite article 『the』 needs to be added to indicate specificity; therefore, it is modified to 『the park』 to comply with grammatical norms.

error_sentence: But start raining in afternoon, I don't have umbella.
correct_sentence: But it started raining in the afternoon, and I didn't have an umbrella.
error: start
correction: it started
error_type: Verb Tense Error
error_severity: 5
error_description: ① Pronoun Error: According to English grammar rules, a declarative sentence must contain a clear subject; the original sentence lacks a subject component, the dummy subject 『it』 needs to be added to meet sentence structure requirements and make the expression complete and standard; ② Verb Tense Error: Based on the context's time adverbial, the verb 〈start〉 should use the past tense to maintain tense consistency; therefore, the present simple tense 〈start〉 is changed to the past tense 『started』, complying with English tense matching rules.

error_sentence: But start raining in afternoon, I don't have umbella.
correct_sentence: But it started raining in the afternoon, and I didn't have an umbrella.
correction: the
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: According to English fixed collocation rules, the specific time period 〈afternoon〉 following the preposition 〈in〉 must be paired with the definite article 〈the〉 to form a standard time expression structure; therefore, the definite article 『the』 is added, correcting 〈in afternoon〉 to the grammatically standard expression 『in the afternoon』.

error_sentence: But start raining in afternoon, I don't have umbella.
correct_sentence: But it started raining in the afternoon, and I didn't have an umbrella.
error: I do
correction: and I did
error_type: Conjunction Error
error_severity: 5
error_description: ① Conjunction Error: According to English parallel structure rules, when a sentence contains multiple parallel actions, a conjunction (such as 『and』) is needed to connect the clauses; the original sentence lacks a logical connector between actions, therefore, the coordinating conjunction 『and』 is added to ensure semantic coherence; ② Verb Tense Error: Based on the principle of tense consistency in context, when describing actions that occurred in the past, the verb 〈do〉 should be in its past tense form; therefore, the base verb 〈do〉 is changed to the past tense 『did』 to match the overall past tense of the sentence.

error_sentence: But start raining in afternoon, I don't have umbella.
correct_sentence: But it started raining in the afternoon, and I didn't have an umbrella.
error: umbella
correction: an umbrella
error_type: Determiner Error
error_severity: 2
error_description: ① Determiner Error: According to English grammar rules, the singular countable noun 〈umbrella〉 starts with a vowel sound /ʌ/ and requires the indefinite article 『an』; therefore, it is corrected to 『an umbrella』 to comply with the article usage rule "use 'an' before a vowel sound"; ② Spelling Error: According to English spelling rules, 〈umbella〉 is an incorrect spelling; the correct spelling should be 『umbrella』; this word refers to the item "umbrella", the correction ensures accurate meaning conveyance.

error_sentence: I have get wet I'm very cold and very handache.
correct_sentence: I got wet and I was very cold and had a headache.
error: have get wet I'm
correction: got wet and I was
error_type: Conjunction Error
error_severity: 5
error_description: ① Auxiliary Error: According to English grammar rules, 〈have〉 forms an incorrect combination with 〈get〉 in this sentence, leading to semantic redundancy; the auxiliary verb 〈have〉 is directly deleted, retaining the main predicate verb 『got』; ② Verb Tense Error: Based on the principle of tense consistency in context, when describing actions that occurred in the past, the verb 〈get〉 should be in its past tense form; therefore, the base verb 〈get〉 is changed to the past tense 『got』 to match the overall past tense of the sentence; ③ Conjunction Error: According to English parallel structure rules, when a sentence contains multiple parallel actions or states, a conjunction is needed to connect the clauses; the original sentence lacks a logical connector between actions, therefore, the coordinating conjunction 『and』 is added to ensure semantic coherence; ④ Verb Tense Error: Based on the principle of tense consistency in context, when describing a past continuous state, the linking verb should be in the past tense; therefore, the present tense 〈I'm〉 is changed to the past tense 『I was』 to maintain consistency with the overall past tense of the sentence.

error_sentence: I'm very cold and very handache. my friends ba wo songdao le yiyuan.
correct_sentence: and I was very cold and had a headache. My friends took me to the hospital.
error: very handache. my friends ba wo songdao le yiyuan
correction: had a headache. My friends took me to the hospital
error_type: Verb Choice Error
error_severity: 5
error_description: ① Verb Choice Error: According to English fixed collocations, 〈I'm very cold and very handache〉 has a grammatical structure problem; the adjective 〈cold〉 and the noun 〈handache〉 cannot be directly paralleled; the verb phrase 『had a』 should be used to connect the symptom description, modified to 『I'm very cold and had a headache』 to conform to English expression habits; ② Spelling Error: According to English spelling rules, 〈handache〉 is an incorrect spelling; the correct spelling should be 『headache』 (head pain); ③ Case Error: According to English writing conventions, the first letter of a sentence following a period needs to be capitalized; therefore, the first word 〈my〉 should be capitalized as 『My』 to conform to standards; ④ Other Error: According to English grammar norms, the non-English expression 〈ba wo songdao le yiyuan〉 should be converted to the standard English verb phrase 『took me to the hospital』, using the past tense verb 『took』 paired with the prepositional phrase 『to the hospital』 to form a complete predicate structure.

error_sentence: The dother says I have fever so give me medicine.
correct_sentence: The doctor said I had a fever and gave me medicine.
error: dother says I have fever so give
correction: doctor said I had a fever and gave
error_type: Conjunction Error
error_severity: 5
error_description: ① Spelling Error: According to English spelling rules, 〈dother〉 is an incorrect spelling; the correct noun spelling should be 『doctor』, indicating the profession "doctor"; ② Verb Tense Error: Based on the principle of tense consistency in context, the clause verb 〈says〉 needs to be consistent with the main clause's past tense, therefore, it is changed to the past tense 『said』; simultaneously, the predicate verb 〈give〉 needs to be adjusted to the past tense 『gave』 to comply with grammar rules; ③ Determiner Error: According to common English expressions, "have a fever" is the standard way to say "发烧", meaning that 〈fever〉 needs to be modified by the indefinite article "a"; therefore, 〈fever〉 should be changed to 『a fever』; ④ Conjunction Error: Based on syntactic logical analysis, the original sentence's 〈so〉 is misused as a causal conjunction; the actual context requires expressing a parallel relationship, therefore, it is replaced with the coordinating conjunction 『and』 to maintain semantic coherence.