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 went to a park to have a picnic. There was sunny in the morning. We flied kites in the sky. But in the afternoon, It was rainy. I didn't put the umbrella and I got wet. Then, I felt very cold and have a headache. My friends took me to the hospital. Doctor saied me have a fever. He gived me some medicine and told me go home to have a rest.

Corrected essay:
Last Sunday, my friends and I went to a park to have a picnic. It was sunny in the morning. We flew kites in the sky. But in the afternoon, it was rainy. I didn't bring an umbrella and I got wet. Then, I felt very 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 to have a rest.

Error analysis:
error_sentence: Last Sunday. My friends and I went to a park to have a picnic.
correct_sentence: Last Sunday, my friends and I went to a park to have a picnic.
error: . My
correction: , my
error_type: Punctuation Error
error_severity: 2
error_description: ① Punctuation Error: According to English grammar rules, a comma 『,』 should follow the introductory time adverbial 〈Last Sunday〉 to connect it to the subsequent content and maintain sentence fluency. The original sentence uses a period to separate the time adverbial from the main clause, which is a punctuation error. Therefore, 〈.〉 should be changed to 『,』; ② Case Error: According to English writing conventions, except for the first word of a sentence and proper nouns, the first letter of common words does not need to be capitalized. In the original sentence, 〈My〉 in 〈My friends〉 is capitalized due to the preceding punctuation error. After correcting the punctuation, 〈My〉 should be changed to lowercase 『my』 to comply with writing conventions.
error_sentence: There was sunny in the morning.
correct_sentence: It was sunny in the morning.
error: There
correction: It
error_type: Pronoun Error
error_severity: 3
error_description: ① Pronoun Error: According to English expression conventions, when describing weather conditions, the personal pronoun 『It』 is required as the subject, forming the structure "It + be + adjective describing weather". The "There be" structure used in the original sentence is for indicating the existence of something somewhere and is not suitable for describing weather. Therefore, 〈There〉 needs to be changed to 『It』 to make the sentence conform to English expression conventions.
error_sentence: We flied kites in the sky.
correct_sentence: We flew kites in the sky.
error: flied
correction: flew
error_type: Spelling Error
error_severity: 2
error_description: ① Spelling Error: According to English spelling rules, the past tense of the verb "fly" is the irregular spelling "flew". The original sentence describes an action that happened last Sunday, requiring the past tense; 〈flied〉 is an incorrect spelling form, constituting a spelling error. Therefore, 〈flied〉 needs to be changed to 『flew』 to both comply with spelling rules and correctly express the past action.
error_sentence: But in the afternoon, It was rainy.
correct_sentence: But in the afternoon, it was rainy.
error: It
correction: it
error_type: Case Error
error_severity: 1
error_description: ① Case Error: According to English writing conventions, except for the first word of a sentence and proper nouns, the first letter of other words is usually lowercase. In the original sentence, 〈It〉 after the comma is neither the beginning of the sentence nor a proper noun; capitalizing its first letter does not conform to conventions and is a case error. Therefore, 〈It〉 needs to be changed to lowercase 『it』 to comply with English writing rules.
error_sentence: I didn't put the umbrella and I got wet.
correct_sentence: I didn't bring an umbrella and I got wet.
error: put the
correction: bring an
error_type: Verb Choice Error
error_severity: 4
error_description: ① Verb Choice Error: According to the sentence meaning, the intention here is to express "carrying an umbrella". "put" means "to place", which does not fit the context, constituting a verb choice error. In English, "bring" should be used to express "carrying", so 〈put〉 needs to be changed to 『bring』; ② Determiner Error: According to English article usage rules, when "umbrella" is mentioned for the first time and refers to a general instance, and its pronunciation begins with a vowel sound, the indefinite article "an" is required. "the" is a definite article used for specific reference, which is not applicable here, constituting a determiner error. 〈the〉 needs to be changed to 『an』.
error_sentence: Then, I felt very cold and have a headache.
correct_sentence: Then, I felt very cold and had a headache.
error: have
correction: had
error_type: Verb Tense Error
error_severity: 3
error_description: ① Verb Tense Error: According to the English rule that verbs connected by the coordinating conjunction 〈and〉 should have consistent tenses, in the original sentence, 〈felt〉 is in the past tense, while 〈have〉 is in the base form. The tenses are inconsistent, which is a verb tense error. Therefore, 〈have〉 needs to be changed to 『had』 to maintain tense consistency and make the sentence comply with English grammar rules.
error_sentence: Doctor saied me have a fever.
correct_sentence: The doctor said I had a fever.
error: Doctor saied me have
correction: The doctor said I had
error_type: Sentence Structure Error
error_severity: 4
error_description: ① Determiner Error: According to English grammar rules, when the profession noun 〈doctor〉 serves as the subject, the article 『The』 is usually required for specific reference. The original sentence lacks the article, which does not conform to grammar rules; 『The』 needs to be added before 〈doctor〉; ② Spelling Error: According to the sentence meaning, the intention is to express "said". 〈saied〉 is an incorrect spelling of the past tense 『said』 of the verb "say"; 〈saied〉 needs to be corrected to 『said』; ③ Pronoun Error: According to English grammar rules, in the object clause following "said", 『I』 should be used as the subject of the clause. 〈me〉 is an object pronoun, so 〈me〉 should be changed to 『I』; ④ Verb Tense Error: Indirect speech is used here, requiring a backshift in tense from the original statement. Since the main clause uses the simple past tense, indicating a past event, the subordinate clause should also use the simple past tense. 〈have〉 should be changed to 『had』 to comply with English sentence structure rules.
error_sentence: He gived me some medicine and told me go home to have a rest.
correct_sentence: He gave me some medicine and told me to go home to have a rest.
error: gived
correction: gave
error_type: Spelling Error
error_severity: 2
error_description: ① Spelling Error: According to the sentence meaning, the intention is to express the past tense of "give". In English, the past tense of the verb "give" is the irregular spelling 『gave』; 〈gived〉 is an incorrect spelling form. Therefore, 〈gived〉 needs to be changed to 『gave』 to comply with English spelling rules.
error_sentence: He gived me some medicine and told me go home to have a rest.
correct_sentence: He gave me some medicine and told me to go home to have a rest.
correction: to
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: ① Nonfinite Verb Form Error: According to English grammar rules, the common structure for the verb 〈tell〉 is 『tell someone to do something』, where the infinitive marker 『to』 cannot be omitted for a complete grammatical structure. The original phrase 〈told me go〉 omits 〈to〉, which is a nonfinite verb form error. Therefore, 〈told me go〉 needs to be changed to 『told me to go』 to make the sentence grammatically complete.