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 Store is very cheap. All kinds of different colours' sweaters only sell 30 yuan. Shorts only sell 20 yuan. T-shirt only sell 25 yuan. Big bags sell 35 yuan and samll bags sell 20 yuan. There are many beautiful shoes and skirt. Welcome to here.

Corrected essay:
Goods in Mr. Cool's Store are very cheap. All kinds of different colored sweaters only sell for 30 yuan. Shorts sell for only 20 yuan. T-shirts sell for only 25 yuan. Big bags sell for 35 yuan and small bags sell for 20 yuan. There are many beautiful shoes and skirts. Welcome to the store.

Error analysis:
error_sentence: Mr. Cool's Store is very cheap.
correct_sentence: Goods in Mr. Cool's Store are very cheap.
correction: Goods in
error_type: Sentence Structure Error
error_severity: 3
error_description: Sentence Structure Error: 〈Store〉 as a building cannot be described as 'cheap', so it cannot be the subject here; according to the semantics, it should refer to 'the goods in the store are cheap', so the subject is missing; therefore, adding 『Goods in』 before 〈Mr, Cool's〉 as the subject makes the sentence structure complete and clearly expresses that the store's goods are cheap.

error_sentence: Mr. Cool's Store is very cheap.
correct_sentence: Goods in Mr. Cool's Store are very cheap.
error: is
correction: are
error_type: Subject-Verb Agreement Error
error_severity: 3
error_description: Subject-Verb Agreement Error: The subject here is the collective noun 'Goods', which requires a plural verb form; therefore, there is a subject-verb agreement error, and 〈is〉 needs to be changed to 『are』 to comply with English grammar rules.

error_sentence: All kinds of different colours' sweaters only sell 30 yuan.
correct_sentence: All kinds of different colored sweaters only sell for 30 yuan.
error: colours'
correction: colored
error_type: PoS Confusion Error
error_severity: 3
error_description: PoS Confusion Error: The adjective form of color should be used here to modify sweaters, meaning 'colored sweaters'; in the original text, the noun possessive 〈colours'〉 is misused as an adjective, resulting in a morphology error; therefore, it should be changed to the adjective 『colored』 to modify the noun 〈sweaters〉.

error_sentence: All kinds of different colours' sweaters only sell 30 yuan.
correct_sentence: All kinds of different colored sweaters only sell for 30 yuan.
correction: for
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: The verb 〈sell〉 needs to be paired with the preposition 'for' to form the fixed phrase 〈sell for + price〉 to indicate the price; therefore, a preposition is missing in this sentence, and 『for』 needs to be added after 〈sell〉 to conform to the English fixed phrase.

error_sentence: Shorts only sell 20 yuan.
correct_sentence: Shorts sell for only 20 yuan.
error: only sell
correction: sell for only
error_type: Word Order Error
error_severity: 5
error_description: ① Preposition Error: In English, the verb 〈sell〉 needs to be paired with the preposition 'for' to form the fixed phrase 〈sell for + price〉 to indicate the price; therefore, a preposition is missing in this sentence, and 〈sell〉 needs to be changed to 『sell for』 to conform to the English fixed phrase; ② Word Order Error: The adverb 〈only〉 should be placed after the prepositional phrase and before the specific price to clearly modify the price; therefore, this sentence should be changed to 『sell for only』 to conform to the standard order of modification in English.

error_sentence: T-shirt only sell 25 yuan.
correct_sentence: T-shirts sell for only 25 yuan.
error: shirt only sell
correction: shirts sell for only
error_type: Word Order Error
error_severity: 5
error_description: ① Noun Number Error: As a countable noun, 〈T-shirt〉 should be in the plural form 『T-shirts』 here to express a general sense, conforming to English expression habits; ② Word Order Error: 〈only〉 should be placed before the specific price 〈25 yuan〉 to emphasize the cheapness of the price; therefore, 『only』 should be added before 〈25 yuan〉 to conform to the standard order of modification in English; ③ Preposition Error: In English, the verb 〈sell〉 needs to be paired with the preposition 'for' to form the fixed phrase 'sell for + price' to indicate the price; therefore, a preposition is missing in this sentence, and 〈sell〉 needs to be changed to 『sell for』 to conform to the English fixed phrase.

error_sentence: Big bags sell 35 yuan and samll bags sell 20 yuan.
correct_sentence: Big bags sell for 35 yuan and small bags sell for 20 yuan.
correction: for
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: In English, the verb 〈sell〉 needs to be paired with the preposition 'for' to form the fixed phrase 〈sell for + price〉 to indicate the price; therefore, a preposition is missing in this sentence, and 〈sell〉 needs to be changed to 『sell for』 to conform to the English fixed phrase.

error_sentence: Big bags sell 35 yuan and samll bags sell 20 yuan.
correct_sentence: Big bags sell for 35 yuan and small bags sell for 20 yuan.
error: samll
correction: small
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the sentence meaning, the intention here is to express 'small'; therefore, the word 〈samll〉 is misspelled and should be changed to 『small』 to fit the semantics.

error_sentence: Big bags sell 35 yuan and samll bags sell 20 yuan.
correct_sentence: Big bags sell for 35 yuan and small bags sell for 20 yuan.
correction: for
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: In English, the verb 〈sell〉 needs to be paired with the preposition 'for' to form the fixed phrase 〈sell for + price〉 to indicate the price; therefore, a preposition is missing in this sentence, and 〈sell〉 needs to be changed to 『sell for』 to conform to the English fixed phrase.

error_sentence: There are many beautiful shoes and skirt.
correct_sentence: There are many beautiful shoes and skirts.
error: skirt
correction: skirts
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: In this sentence, 〈and〉 connects two parallel components, whose number needs to be consistent; the preceding noun is plural 〈shoes〉, so 〈skirt〉, as a countable noun, also needs to be in the plural form; therefore, there is a noun number error here, and the singular noun 〈skirt〉 needs to be changed to the plural noun 『skirts』 to conform to English grammar rules.

error_sentence: Welcome to here.
correct_sentence: Welcome to the store.
error: here
correction: the store
error_type: Noun Error
error_severity: 3
error_description: Noun Error: Here, 〈here〉 is an adverb, and an adverb cannot directly serve as the object of the preposition 〈to〉; according to the context, it refers to 'the store'; therefore, 〈here〉 needs to be replaced with a corresponding noun or pronoun; since it specifically refers to 'that store', 〈here〉 should be changed to 『the store』 to conform to English grammar rules and contextual meaning.