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:
Come and buy some clothes. It's very cheap. All colors of seweets only sells 30 yuan. Shouts only sells 20 yuan. T-shirt only sells 25 yuan. Large bags sell 35 yuan. Handbag sell 20 yuan. There are a lot of dresses and skirts. Welcom to Mr. Cool's Clothes Store.

Corrected essay:
Come and buy some clothes. They're very cheap. All colors of sweaters only sell for 30 yuan. Shorts only sell for 20 yuan. T-shirts only sell for 25 yuan. Large bags sell for 35 yuan. Handbags sell for 20 yuan. There are a lot of dresses and skirts. Welcome to Mr. Cool's Clothes Store.

Error analysis:
error_sentence: It's very cheap.
correct_sentence: They're very cheap.
error: It's
correction: They're
error_type: Subject-Verb Agreement Error
error_severity: 5
error_description: ① Pronoun Error: According to the context, this refers to 'the goods in the store are very cheap', so the subject requires a plural pronoun. Therefore, there is a pronoun error here. The singular word 〈It〉 needs to be changed to the plural pronoun 『They』 to fit the context; ② Subject-verb Agreement Error: The plural pronoun 〈They〉 requires a corresponding plural verb form. The original sentence 〈It's〉 is the contraction of 'It is', so the singular verb form 〈is〉 needs to be changed to the plural form 『are』 to comply with the subject-verb agreement principle.
error_sentence: All colors of seweets only sells 30 yuan.
correct_sentence: All colors of sweaters only sell for 30 yuan.
error: seweets only sells
correction: sweaters only sell for
error_type: Subject-Verb Agreement Error
error_severity: 5
error_description: ① Spelling Error: According to English spelling rules, the correct plural form of the countable noun 'sweater' is 'sweaters', thus there is a spelling error here. 〈seweets〉 needs to be changed to 『sweaters』 to conform to English spelling norms; ② Subject-verb Agreement Error: A plural countable noun as the subject requires the plural form of the verb; the third-person singular form 〈sells〉 needs to be changed to the plural form 『sell』 to comply with the subject-verb agreement principle; ③ Preposition Error: According to English grammar rules, the fixed phrase for 'sell for xxx price' is 'sell for + specific price', thus a preposition is missing here. The preposition 『for』 needs to be added before the specific price 〈30 yuan〉 to form the complete structure meaning 'sell for 30 yuan' to conform to the English fixed phrase.
error_sentence: Shouts only sells 20 yuan.
correct_sentence: Shorts only sell for 20 yuan.
error: Shouts only sells
correction: Shorts only sell for
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Spelling Error: According to the prompt, this refers to the 'shorts' sold in the store, requiring the plural form for generic reference, and since it's at the beginning of the sentence, the first letter needs to be capitalized. Therefore, the misspelling 〈Shouts〉 should be changed to 『Shorts』 to conform to English spelling norms and the original prompt; ② Subject-verb Agreement Error: A plural countable noun as the subject requires the plural form of the verb; the third-person singular form 〈sells〉 needs to be changed to the plural form 『sell』 to comply with the subject-verb agreement principle; ③ Preposition Error: According to English grammar rules, the fixed phrase for 'sell for xxx price' is 'sell for + specific price', thus a preposition is missing here. The preposition 『for』 needs to be added before the specific price 〈20 yuan〉 to form the complete structure meaning 'sell for 20 yuan' to conform to the English fixed phrase.
error_sentence: T-shirt only sells 25 yuan.
correct_sentence: T-shirts only sell for 25 yuan.
error: shirt only sells
correction: shirts only sell for
error_type: Subject-Verb Agreement Error
error_severity: 5
error_description: ① Noun Number Error: This refers to the 'shirts' sold in the store, requiring the plural form for generic reference, and since it's at the beginning of the sentence, the first letter needs to be capitalized, thus 〈T-shirt〉 should be changed to 『T-shirts』 to conform to the meaning and syntactic rules; ② Subject-verb Agreement Error: A plural countable noun as the subject requires the plural form of the verb; the third-person singular form 〈sells〉 needs to be changed to the plural form 『sell』 to comply with the subject-verb agreement principle; ③ Preposition Error: According to English grammar rules, the fixed phrase for 'sell for xxx price' is 'sell for + specific price', thus a preposition is missing here. The preposition 『for』 needs to be added before the specific price 〈25 yuan〉 to form the complete structure meaning 'sell for 25 yuan' to conform to the English fixed phrase.
error_sentence: Large bags sell 35 yuan.
correct_sentence: Large bags sell for 35 yuan.
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English grammar rules, the fixed phrase for 'sell for xxx price' is 'sell for + specific price', thus a preposition is missing here. The preposition 『for』 needs to be added before the specific price 〈35 yuan〉 to form the complete structure meaning 'sell for 35 yuan' to conform to the English fixed phrase.
error_sentence: Handbag sell 20 yuan.
correct_sentence: Handbags sell for 20 yuan.
error: Handbag sell
correction: Handbags sell for
error_type: Noun Number Error
error_severity: 5
error_description: ① Noun Number Error: This refers to the 'small bags' sold in the store, requiring the plural form for generic reference, and since it's at the beginning of the sentence, the first letter needs to be capitalized, thus 〈Handbag〉 should be changed to 『Handbags』 to conform to the meaning and syntactic rules; ② Preposition Error: According to English grammar rules, the fixed phrase for 'sell for xxx price' is 'sell for + specific price', thus a preposition is missing here. The preposition 『for』 needs to be added before the specific price 〈20 yuan〉 to form the complete structure meaning 'sell for 20 yuan' to conform to the English fixed phrase.
error_sentence: Welcom to Mr. Cool's Clothes Store.
correct_sentence: Welcome to Mr. Cool's Clothes Store.
error: Welcom
correction: Welcome
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the original prompt, the intended meaning here is 'welcome to shop'. The correct spelling for the English word 'welcome' is 'welcome', thus there is a spelling error here. The misspelling 〈Welcom〉 needs to be changed to 『Welcome』 to conform to English spelling norms and the original prompt.