Writing prompt: You have a beautiful pencil case with some stationery inside. On Monday, when you went to school, you couldn't find your crayons in your pencil case. Your friend Amy gave you some to use for drawing.
Based on this information, write a short English essay.
Writing hints: pencil case; crayons; draw.

Student essay:
I have a beautiful pencil case. There are two pen and a ruler, I also have some crayons. On Monday. I go to school by bus. When I have art lesson, I don't find my crayons. I, m very sad! But Amy give me some crayons to draw.

Corrected essay:
I have a beautiful pencil case. There are two pens and a ruler. I also have some crayons. On Monday, I went to school by bus. When I had an art lesson, I couldn't find my crayons. I was very sad! But Amy gave me some crayons to draw with.

Error analysis:
error_sentence: There are two pen and a ruler, I also have some crayons.
correct_sentence: There are two pens and a ruler.
error: pen
correction: pens
error_type: Noun Number Error
error_severity: 2
error_description: Noun Number Error: According to English grammar rules, when the number 〈two〉 directly modifies the countable noun 〈pen〉, the countable noun must be in its plural form. Therefore, the singular noun 〈pen〉 is changed to the plural noun 『pens』 to maintain grammatical consistency.
error_sentence: There are two pen and a ruler, I also have some crayons.
correct_sentence: There are two pens and a ruler.
error: ,
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English grammar rules, a comma 〈,〉 cannot connect two independent clauses 〈There are two pen and a ruler〉 and 〈I also have some crayons〉. A period 『.』 must be used here to separate these two sentences to comply with English punctuation standards for compound sentences.
error_sentence: On Monday. I go to school by bus.
correct_sentence: On Monday, I went to school by bus.
error: . I go
correction: , I went
error_type: Verb Tense Error
error_severity: 3
error_description: ① Punctuation Error: According to English grammar rules, a period cannot connect the time adverbial 〈On Monday〉 and the main clause; it must be changed to a comma 『,』 to correctly reflect the relationship between the adverbial and the main clause and ensure sentence coherence; ② Verb Tense Error: According to the grammatical principle that the time adverbial and the verb tense must correspond, the text describes something that has already happened, so the present tense verb 〈go〉 must be changed to the past tense 『went』 to maintain tense consistency.
error_sentence: When I have art lesson, I don't find my crayons.
correct_sentence: When I had an art lesson, I couldn't find my crayons.
error: have
correction: had an
error_type: Verb Tense Error
error_severity: 4
error_description: ① Determiner Error: According to English grammar rules, the singular countable noun 〈art lesson〉 requires a determiner before it. Since 'art' begins with a vowel sound, the indefinite article 『an』 needs to be added to form the grammatically correct noun phrase 『an art lesson』; ② Verb Tense Error: Based on the context's time reference (describing past events), the original sentence's present tense 〈have〉 does not match the intended past tense of the event being described; it should be changed to the simple past tense 『had』 to maintain tense consistency. The final correction is 『had an art lesson』.
error_sentence: When I have art lesson, I don't find my crayons.
correct_sentence: When I had an art lesson, I couldn't find my crayons.
error: do
correction: could
error_type: Auxiliary Error
error_severity: 3
error_description: Auxiliary Error: According to the sentence meaning expressing inability in the past, the past modal verb 〈couldn't〉 should be used. However, 〈don't〉 is the present tense negative auxiliary verb, which does not match the past tense. Therefore, 〈don't〉 needs to be changed to 『couldn't』 to comply with the correct tense and modal verb combination.
error_sentence: I, m very sad!
correct_sentence: I was very sad!
error: , m
correction: was
error_type: Verb Tense Error
error_severity: 3
error_description: ① Punctuation Error: According to English writing conventions, a comma should not be used between the pronoun 〈I〉 and the verb 'am', and the correct punctuation for the contraction is 『’』. Therefore, the comma in 〈I, m〉 should be removed and changed to 『I’m』 to follow correct punctuation rules; ② Verb Tense Error: Based on the time adverbial 〈On Monday〉 and the context, this part refers to past time, but 〈I, m〉 is in the present tense, which is inconsistent. Therefore, 〈I, m〉 needs to be changed to 『I was』 to maintain tense consistency.
error_sentence: But Amy give me some crayons to draw.
correct_sentence: But Amy gave me some crayons to draw with.
error: give
correction: gave
error_type: Verb Tense Error
error_severity: 2
error_description: Verb Tense Error: Based on the time adverbial 〈On Monday〉 and the context, this part refers to past time, but the verb 〈give〉 is in the present tense, which is inconsistent with the past time. Therefore, 〈give〉 needs to be changed to 『gave』 to comply with the simple past tense rules.
error_sentence: But Amy give me some crayons to draw.
correct_sentence: But Amy gave me some crayons to draw with.
correction: with
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English collocation rules, when the verb 〈draw〉 means 'to draw with a tool', it needs to be followed by the preposition 『with』 to introduce the object 'crayons'. Therefore, 『with』 needs to be added at the end of the sentence to form a complete prepositional structure.