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:
Mr. Cool's Clothes Store is a big sale, which is very favorable. ITowels of various colors are only sold in 30 yuan, shorts are only sold in 20 yuan and shirts are only sold in 25 yuan. IThe big package sells 35 yuan, and the small package sells 20 yuan. There are also many beautiful shoes and skirts, welcome to buy.

Corrected essay:
Mr. Cool's Clothes Store is having a big sale, which is very favorable. Sweaters of various colors are only sold for 30 yuan, shorts are only sold for 20 yuan and shirts are only sold for 25 yuan. The big package sells for 35 yuan, and the small package sells for 20 yuan. There are also many beautiful shoes and skirts. Welcome to buy.

Error analysis:
error_sentence: Mr. Cool's Clothes Store is a big sale, which is very favorable.
correct_sentence: Mr. Cool's Clothes Store is having a big sale, which is very favorable.
correction: having
error_type: Verb Choice Error
error_severity: 3
error_description: Verb Choice Error: According to English expression habits, when describing a store having a big sale, the simple linking verb 〈is〉 cannot be used. The present progressive tense is needed here to show the action is ongoing; 『having』 should be used, forming the structure 『is having a big sale』, which accurately expresses the state of the store conducting a promotional activity, conforming to the expression requirements of commercial promotion scenarios.

error_sentence: ITowels of various colors are only sold in 30 yuan, shorts are only sold in 20 yuan and shirts are only sold in 25 yuan.
correct_sentence: Sweaters of various colors are only sold for 30 yuan, shorts are only sold for 20 yuan and shirts are only sold for 25 yuan.
error: ITowels
correction: Sweaters
error_type: Noun Error
error_severity: 3
error_description: Noun Error: According to the context, the meaning of 〈ITowels〉 in the original sentence does not match the actual commodity to be described; according to the prompt, 『Sweaters』 should be used to represent sweaters.

error_sentence: ITowels of various colors are only sold in 30 yuan, shorts are only sold in 20 yuan and shirts are only sold in 25 yuan.
correct_sentence: Sweaters of various colors are only sold for 30 yuan, shorts are only sold for 20 yuan and shirts are only sold for 25 yuan.
error: in
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, when indicating the selling price of a commodity, the preposition 〈for〉 is needed to connect the commodity and the specific price. The use of 〈in〉 in the original sentence does not conform to the fixed collocation “sold for + price” and cannot correctly express the commodity price; 〈in〉 should be changed to 『for』 to make the sentence expression conform to English habits.

error_sentence: ITowels of various colors are only sold in 30 yuan, shorts are only sold in 20 yuan and shirts are only sold in 25 yuan.
correct_sentence: Sweaters of various colors are only sold for 30 yuan, shorts are only sold for 20 yuan and shirts are only sold for 25 yuan.
error: in
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, when expressing the selling price of a commodity, the preposition 〈for〉 is needed to connect the commodity and the price. The preposition 〈in〉 used in 〈in 20 yuan〉 in the original sentence does not conform to expression habits and cannot correctly express the commodity selling price. 〈in〉 should be changed to 『for』 to make the sentence conform to the fixed collocation “sold for + price”, ensuring uniformity of sentence structure and accuracy of expression.

error_sentence: ITowels of various colors are only sold in 30 yuan, shorts are only sold in 20 yuan and shirts are only sold in 25 yuan.
correct_sentence: Sweaters of various colors are only sold for 30 yuan, shorts are only sold for 20 yuan and shirts are only sold for 25 yuan.
error: in
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, when expressing the selling price of a commodity, the preposition 〈for〉 is needed to connect the commodity and the price. The preposition 〈in〉 used in 〈in 25 yuan〉 in the original sentence does not conform to expression habits and cannot correctly express the commodity selling price. 〈in〉 should be changed to 『for』 to make the sentence conform to the fixed collocation “sold for + price”, ensuring uniformity of sentence structure and accuracy of expression.

error_sentence: IThe big package sells 35 yuan, and the small package sells 20 yuan.
correct_sentence: The big package sells for 35 yuan, and the small package sells for 20 yuan.
error: IThe
correction: The
error_type: Word Redundancy Error
error_severity: 4
error_description: Word Redundancy Error: According to English grammar rules, 〈I〉 in the original sentence is a redundant component; 〈I〉 should be deleted to make the sentence subject 〈The big package〉 clearer.

error_sentence: IThe big package sells 35 yuan, and the small package sells 20 yuan.
correct_sentence: The big package sells for 35 yuan, and the small package sells for 20 yuan.
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, when describing the selling price of a commodity, the preposition 〈for〉 is needed after the verb 〈sells〉 to introduce the specific price. The original sentence lacks 〈for〉 and does not conform to the standard expression structure “sell for + price”. Adding 〈for〉 enables the sentence expression to conform to English habits and accurately convey commodity selling price information.

error_sentence: IThe big package sells 35 yuan, and the small package sells 20 yuan.
correct_sentence: The big package sells for 35 yuan, and the small package sells for 20 yuan.
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English grammar rules and expression habits, when describing the selling price of a commodity, the preposition 〈for〉 is needed after “sell” to connect the price. The original phrase 〈sells 20 yuan〉 lacks 〈for〉, does not conform to the fixed collocation “sell for + price”, and cannot accurately express the commodity selling price. Adding 〈for〉 makes the sentence expression conform to English habits, ensuring consistency in the use of prepositions in parallel structures and grammatical completeness.

error_sentence: There are also many beautiful shoes and skirts, welcome to buy.
correct_sentence: There are also many beautiful shoes and skirts. Welcome to buy.
error: , welcome
correction: . Welcome
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English grammar rules, 〈There are also many beautiful shoes and skirts〉 and 〈welcome to buy〉 are two independent sentences; connecting them with a comma in the original sentence does not conform to grammatical norms. A period should be added before 〈welcome to buy〉, changing 〈, welcome〉 to 『. Welcome』, making them two independent and complete sentences.