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 have a picnic in park with my friends. In that afternoon, It begins raining, but I forget take out umbrella. So, I get wet.

Corrected essay:
Last Sunday, I had a picnic in the park with my friends. In that afternoon, it began raining, but I had forgotten to take my umbrella. So, I got wet.

Error analysis:
error_sentence: Last Sunday, I have a picnic in park with my friends.
correct_sentence: Last Sunday, I had a picnic in the park with my friends.
error: have
correction: had
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: The time adverbial 〈Last Sunday〉 indicates the action occurred in the past, so the main clause requires the simple past tense; therefore, the verb 〈have〉 needs to be changed to the past tense form 『had』 to match the context.
error_sentence: Last Sunday, I have a picnic in park with my friends.
correct_sentence: Last Sunday, I had a picnic in the park with my friends.
correction: the
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English grammar rules, the noun 〈park〉, when used as a singular countable noun, requires a determiner before it; therefore, 『the』 is added to indicate a specific park.
error_sentence: In that afternoon, It begins raining, but I forget take out umbrella.
correct_sentence: In that afternoon, it began raining, but I had forgotten to take my umbrella.
error: It begins
correction: it began
error_type: Verb Tense Error
error_severity: 4
error_description: ① Case Error: Since the main clause is preceded by the time adverbial “In that afternoon”, the first letter of the first word in the main clause does not need to be capitalized; therefore, 〈It〉 should be changed to lowercase 『it』 to conform to sentence writing conventions; ② Verb Tense Error: The time adverbial 〈In that afternoon〉 indicates the event happened in the past, so the main clause requires the simple past tense; therefore, 〈begins〉 is changed to 『began』.
error_sentence: In that afternoon, It begins raining, but I forget take out umbrella.
correct_sentence: In that afternoon, it began raining, but I had forgotten to take my umbrella.
error: forget take out
correction: had forgotten to take my
error_type: Verb Choice Error
error_severity: 4
error_description: ① Verb Tense Error: The action occurred 'before it rained', so the verb needs the past perfect tense; therefore, 〈forget〉 is changed to 『had forgotten』; ② Nonfinite Verb Form Error: 〈forget take〉 does not conform to the infinitive structure; the English expression for 'forget to do sth.' is 'forget to do sth.', so it should be changed to 『to take』; ③ Verb Choice Error: 'take out' means 'to remove from a place', the intended meaning here is 'to bring along', so 'out' is removed; 'take' alone can mean 'to carry'; ④ Determiner Error: 〈umbrella〉 requires the possessive pronoun 『my』 before it to specify ownership, so 『my』 is added before it.
error_sentence: So, I get wet.
correct_sentence: So, I got wet.
error: get
correction: got
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: The main clause describes a past event, requiring the verb 'get' to be changed from the present tense 〈get〉 to the past tense 『got』 to match the sentence meaning.