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:
Next Sunday, my friends and I went to the park. In the afternoon, at the beginning of rained. I forgetted take an umberlla, so I'm wet and cool

Corrected essay:
Last Sunday, my friends and I went to the park. In the afternoon, it began to rain. I forgot to take an umbrella, so I was wet and cold.

Error analysis:
error_sentence: Next Sunday, my friends and I went to the park.
correct_sentence: Last Sunday, my friends and I went to the park.
error: Next
correction: Last
error_type: Adjective Error
error_severity: 2
error_description: Adjective Error: According to the principle of tense consistency in English, the past tense verb 〈went〉 indicates a past action, while the time adverbial 〈Next Sunday〉 points to the future, creating a logical conflict. Therefore, the adjective 〈Next〉 is corrected to 『Last 』, changing the time adverbial to 『Last Sunday』 to ensure the time expression matches the past tense.

error_sentence: In the afternoon, at the beginning of rained.
correct_sentence: In the afternoon, it began to rain.
error: at the beginning of rained
correction: it began to rain
error_type: Sentence Structure Error
error_severity: 5
error_description: ① Pronoun Error: According to English grammar rules, the dummy subject 〈it〉 is required when describing natural phenomena. The original structure 〈at the beginning of rained〉 lacks a subject, so 『it』 is added to form the complete subject-verb structure 『it began to rain』; ② Sentence Structure Error: 〈at the beginning of〉 is a prepositional phrase and cannot function as a predicate. Based on the past tense context, the nominal phrase is changed to the past tense verb 『began』, giving the sentence a core predicate 『it began...』; ③ Nonfinite Verb Form Error: According to the fixed expression "begin to do", the past participle 〈rained〉 is changed to the base form 『rain』 to form the complete infinitive structure 『began to rain』.

error_sentence: I forgetted take an umberlla, so I'm wet and cool
correct_sentence: I forgot to take an umbrella, so I was wet and cold.
error: forgetted
correction: forgot to
error_type: Nonfinite Verb Form Error
error_severity: 4
error_description: ① Spelling Error: According to English verb past tense conjugation rules, the past tense of the verb 〈forget〉 should be the irregular form 『forgot』 to ensure tense accuracy; ② Nonfinite Verb Form Error: According to the usage rule of the verb 〈forget〉, it should be followed by an infinitive (to do) to mean "forgot to do something", requiring the addition of 『to』 to form the complete structure 『forgot to take』.

error_sentence: I forgetted take an umberlla, so I'm wet and cool
correct_sentence: I forgot to take an umbrella, so I was wet and cold.
error: umberlla
correction: umbrella
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English spelling rules, the noun 〈umberlla〉 is misspelled; the correct spelling should be 『umbrella』. This correction ensures the word spelling conforms to English standards and accurately conveys the meaning of "umbrella".

error_sentence: I forgetted take an umberlla, so I'm wet and cool
correct_sentence: I forgot to take an umbrella, so I was wet and cold.
error: 'm
correction: was
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to the contextual tense logic, when describing a state at a specific past moment, the past tense structure (was/were) should be used. Therefore, the present continuous form 〈I'm〉 is changed to the past tense 『was』, forming the standard past structure 『I was wet』 to maintain tense consistency.

error_sentence: I forgetted take an umberlla, so I'm wet and cool
correct_sentence: I forgot to take an umbrella, so I was wet and cold.
error: cool
correction: cold.
error_type: Adjective Error
error_severity: 3
error_description: ① Adjective Error: Based on the common physiological reaction after being caught in the rain, 〈cool〉 merely means "pleasantly cool", while the intended meaning is discomfort from being wet and cold; thus, it is replaced with the stronger term 『cold』 to accurately express the state of feeling cold; ② Punctuation Error: According to English writing conventions, a complete sentence requires punctuation at the end. Since this is a declarative sentence, a period should be added, changing 〈cool〉 to 『cold.』.