Writing prompt: Using the information provided in Chinese and referring to the picture, write a short essay.
Mr. Cool's Clothes Store is having a big sale with great discounts. Sweaters in various colors are only 30 yuan, shorts are only 20 yuan, and shirts are only 25 yuan. Large bags sell for 35 yuan, and small bags for 20 yuan. There are also many beautiful shoes and skirts available. Welcome to shop.

Student essay:
The clothes shop is cheap now. There are many colourful sweaters are 30 yuan. The shorts are 20 yuan. The shirt is 25 yuan. The letter bag is 35 yuan. There are many wonderful shoes and skirts in it. Welcome to there

Corrected essay:
The clothes in the shop are cheap now. There are many colourful sweaters for 30 yuan. The shorts are 20 yuan. The shirts are 25 yuan. The large bags are 35 yuan. There are many wonderful shoes and skirts in it. Welcome there.

Error analysis:
error_sentence: The clothes shop is cheap now.
correct_sentence: The clothes in the shop are cheap now.
error: shop is
correction: in the shop are
error_type: Subject-Verb Agreement Error
error_severity: 3
error_description: ① Noun Error: According to the context of this sentence, the intended meaning is "the clothes in the shop are cheap", so 〈clothes shop is cheap〉 in the original sentence is inappropriate, as "clothes shop" refers to the place itself; it should be changed to 『clothes in the shop』 to meet the semantic requirement for noun usage; ② Subject-Verb Agreement Error: According to English grammar rules, the subject and verb must agree in person and number. The subject of this sentence, 〈clothes〉, is plural. According to grammatical rules, the linking verb paired with it cannot be the singular form 〈is〉; it needs to be changed to the plural form 『are』 to satisfy the principle of subject-verb agreement.

error_sentence: There are many colourful sweaters are 30 yuan.
correct_sentence: There are many colourful sweaters for 30 yuan.
error: are
correction: for
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: According to English grammar rules and usage customs, when expressing the price of goods, the preposition 『for』 should be used to connect the goods and the price, rather than repeating the verb 〈are〉. The original sentence 〈There are many colourful sweaters are 30 yuan.〉 contains both the "there be" structure and the predicate verb 〈are〉, resulting in a sentence structure error. Therefore, 〈are〉 should be changed to 『for』 to make the sentence structure correct and conform to English expression habits.

error_sentence: The shirt is 25 yuan.
correct_sentence: The shirts are 25 yuan.
error: shirt is
correction: shirts are
error_type: Noun Number Error
error_severity: 3
error_description: ① Noun Number Error: According to English grammar rules, in a sales context, it usually refers to the price of multiple items, so the noun should be in the plural form. In the original sentence, 〈shirt〉 is used in the singular form, which does not fit the context and constitutes a noun number error; ② Subject-Verb Agreement Error: After the subject becomes plural, the be verb should agree with it. The use of 〈is〉 in the original sentence is incorrect; 〈shirt is〉 needs to be changed to 『shirts are』 to make the sentence conform to semantic and grammatical rules.

error_sentence: The letter bag is 35 yuan.
correct_sentence: The large bags are 35 yuan.
error: letter bag is
correction: large bags are
error_type: Noun Error
error_severity: 3
error_description: ① Noun Error: In English expression, the collocation 〈letter bag〉 cannot accurately convey the meaning of "large bag" and is an incorrect collocation. According to the context, 『large bags』 should be used to correctly express "large bag", making the noun usage fit the semantic requirement; ② Noun Number Error: In a sales context, when describing the price of goods, the plural form is usually used to indicate multiple items. In the original sentence, 〈bag〉 is used in the singular form, which does not conform to the expression habits of this context and should be changed to the plural form 『bags』; ③ Subject-Verb Agreement Error: In English, the subject and predicate must agree in person and number. When the subject changes to the plural form 『large bags』, the linking verb can no longer be the singular form 〈is〉; it needs to be changed to the plural form 『are』 to satisfy the principle of subject-verb agreement.

error_sentence: Welcome to there
correct_sentence: Welcome there.
error: to there
correction: there.
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: According to English grammar and expression habits, when 〈welcome〉 is followed by the adverb of place 〈there〉, the preposition 〈to〉 is not needed; 〈to〉 is redundant here and constitutes a preposition error. Therefore, 〈to〉 should be deleted to make the sentence concise and conform to norms.