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:
Welcome to our clothes store. All kinds of colors sweaters only sell 30 money. Short pants sell 20 money. Shirts sell 25 money. Big bag sell 35 money and small bag sell 20 money. There are also many boots and blouses. Welcome here!

Corrected essay:
Welcome to our clothes store. All kinds of colored sweaters only sell for 30 yuan. Short pants sell for 20 yuan. Shirts sell for 25 yuan. Big bags sell for 35 yuan and small bags sell for 20 yuan. There are also many boots and blouses. Welcome here!

Error analysis:
error_sentence: All kinds of colors sweaters only sell 30 money.
correct_sentence: All kinds of colored sweaters only sell for 30 yuan.
error: colors
correction: colored
error_type: PoS Confusion Error
error_severity: 3
error_description: PoS Confusion Error: According to the context, the adjective 『colored』 is needed to modify the noun 〈sweaters〉, therefore the noun 〈colors〉 is changed to the adjective 『colored』 to conform to the grammatical structure.
error_sentence: All kinds of colors sweaters only sell 30 money.
correct_sentence: All kinds of colored sweaters only sell for 30 yuan.
error: 30 money
correction: for 30 yuan
error_type: Noun Error
error_severity: 4
error_description: ① Preposition Error: According to the context, the verb 〈sell〉 means 'to sell at a price', requiring the preposition 〈for〉 to form the phrase 『sell for』, thus 『for』 needs to be added; ② Noun Error: In English, 〈money〉 is an uncountable noun and cannot be directly used with a number; it should be changed to the specific currency unit 『yuan』.
error_sentence: Short pants sell 20 money.
correct_sentence: Short pants sell for 20 yuan.
error: 20 money
correction: for 20 yuan
error_type: Noun Error
error_severity: 4
error_description: ① Preposition Error: According to the context, the verb 〈sell〉 means 'to sell at a price', requiring the preposition 〈for〉 to form the phrase 『sell for』, thus 『for』 needs to be added; ② Noun Error: In English, 〈money〉 is an uncountable noun and cannot be directly used with a number; it should be changed to the specific currency unit 『yuan』.
error_sentence: Shirts sell 25 money.
correct_sentence: Shirts sell for 25 yuan.
error: 25 money
correction: for 25 yuan
error_type: Noun Error
error_severity: 4
error_description: ① Preposition Error: According to the context, when the verb 〈sell〉 means 'to sell at a price', it requires the preposition 〈for〉 to form the phrase 『sell for』, thus 『for』 needs to be added; ② Noun Error: In English, 〈money〉 is an uncountable noun and cannot be directly used with a number; it should be changed to the specific currency unit 『yuan』.
error_sentence: Big bag sell 35 money and small bag sell 20 money.
correct_sentence: Big bags sell for 35 yuan and small bags sell for 20 yuan.
error: bag sell 35 money
correction: bags sell for 35 yuan
error_type: Noun Error
error_severity: 5
error_description: ① Noun Number Error: According to the context, the countable noun 〈bag〉 needs to be changed to the plural form 『bags』 to match the meaning of this category of goods; ② Preposition Error: In English, 'to sell at a price' should be expressed as 'sell for', the original sentence needs 『for』 added to form the 『sell for』 structure; ③ Noun Error: In English, 〈money〉 is an uncountable noun and cannot be directly used with a number; it should be changed to the specific currency unit 『yuan』.
error_sentence: Big bag sell 35 money and small bag sell 20 money.
correct_sentence: Big bags sell for 35 yuan and small bags sell for 20 yuan.
error: bag sell 20 money
correction: bags sell for 20 yuan
error_type: Noun Error
error_severity: 4
error_description: ① Noun Number Error: According to the context, the countable noun 〈bag〉 needs to be changed to the plural form 『bags』 to fit the semantics of this category; ② Preposition Error: In English, 'to sell at a price' should be expressed as 'sell for', the original sentence needs 『for』 added to form the 『sell for』 structure; ③ Noun Error: In English, 〈money〉 is an uncountable noun and cannot be directly used with a number; it should be changed to the specific currency unit 『yuan』.