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 big sale, is very cheap. These are colors for sweaters only 30 yuan. Thes are shourts only 20 yuan. Those are shirts only 25 yuan. There are bags only 35 yuan, and small bags only 20 yuan. There are many pretty shoes and skirts. Welcome to Mr. Cool's Clothes Store byu.

Corrected essay:
Mr. Cool's Clothes Store is having a big sale, and the clothes are very cheap. These sweaters in various colors are only 30 yuan. These shorts are only 20 yuan. Those shirts are only 25 yuan. There are bags for only 35 yuan, and small bags for only 20 yuan. There are many pretty shoes and skirts. Welcome to Mr. Cool's Clothes Store to buy.

Error analysis:
error_sentence: Mr. Cool's Clothes Store is big sale, is very cheap.
correct_sentence: Mr. Cool's Clothes Store is having a big sale, and the clothes are very cheap.
correction: having a
error_type: Verb Choice Error
error_severity: 4
error_description: ① Verb Choice Error: According to English expression habits, 〈is big sale〉 in the original sentence cannot accurately convey the meaning 'the store is having a big sale'; the noun 〈sale〉 lacks the necessary verb before it, the verb phrase 『is having a』 should be used to describe the action, making the sentence meaning accurate; ② Determiner Error: In the original sentence describing the big sale, the determiner 'a' is missing before 'big sale'; in English, when 'sale' means 'discount sale', it is often paired with the indefinite article 'a', 『a』 should be added to make the expression conform to grammatical rules.

error_sentence: Mr. Cool's Clothes Store is big sale, is very cheap.
correct_sentence: Mr. Cool's Clothes Store is having a big sale, and the clothes are very cheap.
error: is
correction: and the clothes are
error_type: Conjunction Error
error_severity: 5
error_description: ① Conjunction Error: According to English grammar rules, the two independent clauses 〈is big sale〉 and 〈is very cheap〉 need to be connected by the conjunction 『and』 to maintain coherence and grammatical correctness; ② Sentence Structure Error: The second independent clause lacks a subject, causing missing meaning and sentence structure; the subject 『the clothes』 needs to be added before 〈very cheap〉 to clarify the subject; ③ Subject-Verb Agreement Error: Based on the revised subject 『the clothes』, the verb's number needs to agree with the subject's number, therefore 〈is〉 in the original sentence is a subject-verb agreement error and needs to be changed to 『are』 to comply with English grammar principles.

error_sentence: These are colors for sweaters only 30 yuan.
correct_sentence: These sweaters in various colors are only 30 yuan.
error: are colors for sweaters
correction: sweaters in various colors are
error_type: Sentence Structure Error
error_severity: 4
error_description: ① Sentence Structure Error: The author intends to express 'sweaters of various colors', and the subject part should connect 〈These〉 with the noun, with the post-modifying attributive phrase following, and then the linking verb or main verb; therefore, the structure of 〈These are colors for sweaters〉 is confusing and does not conform to English grammar rules, it should be changed to 『These sweaters in various colors are』 to logically describe the sweaters' colors and the correct modification structure; ② Preposition Error: Based on the context, this refers to sweaters of various colors; when using 'various colors' as an attributive modifying the noun, it needs to be post-positioned, and the preposition 『in』 should be used instead of 〈for〉, also the adjective 'various' needs to be added, combining into 『in various colors』 to modify 'sweaters', finally changing to 『sweaters in various colors』.

error_sentence: Thes are shourts only 20 yuan.
correct_sentence: These shorts are only 20 yuan.
error: Thes are shourts
correction: These shorts are
error_type: Word Order Error
error_severity: 5
error_description: ① Spelling Error: According to the original sentence's meaning, it expresses 'these shorts', so the word 〈Thes〉 is a spelling error and should be changed to 『These』 to conform to correct spelling rules; ② Spelling Error: According to the original sentence's meaning, it intends to express 'shorts', therefore the word 〈shourts〉 is a spelling error and should be changed to 『shorts』 to conform to correct spelling rules; ③ Word Order Error: According to English grammar rules, 『These』 as a modifying determiner should be immediately followed by the modified noun, then the verb, therefore 〈are shourts〉 should be changed to 『shorts are』.

error_sentence: Those are shirts only 25 yuan.
correct_sentence: Those shirts are only 25 yuan.
error: are shirts
correction: shirts are
error_type: Word Order Error
error_severity: 4
error_description: Word Order Error: According to English grammar rules, in the structure where 'demonstrative pronoun + noun' serves as the subject, the verb should follow immediately. The word order in the original sentence 〈Those are shirts〉 is incorrect; 〈are〉 should not be inserted between 〈Those〉 and 〈shirts〉, it needs to be changed to 『Those shirts are』 to make the sentence structure conform to English expression habits.

error_sentence: There are bags only 35 yuan, and small bags only 20 yuan.
correct_sentence: There are bags for only 35 yuan, and small bags for only 20 yuan.
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, when stating the price of items, the preposition 〈for〉 is needed to connect the item and the specific price. The original phrase 〈bags only 35 yuan〉 lacks the preposition 〈for〉; 『for』 should be added, making the phrase 〈bags for only 35 yuan〉, conforming to the grammatical rules for expressing prices; similarly, 〈small bags only 20 yuan〉 also needs 〈for〉 added, changing it to 〈small bags for only 20 yuan〉.

error_sentence: There are bags only 35 yuan, and small bags only 20 yuan.
correct_sentence: There are bags for only 35 yuan, and small bags for only 20 yuan.
correction: for
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, when stating the price of items, the preposition 〈for〉 is needed to connect the item and the specific price. The original phrase 〈bags only 35 yuan〉 lacks the preposition 〈for〉 and cannot accurately express the price relationship; 『for』 should be added to conform to the standard form 〈bags for only 35 yuan〉; similarly, 〈small bags only 20 yuan〉 also lacks the preposition 〈for〉, to maintain consistency in sentence structure and correctly convey price information, 『for』 needs to be added, changing it to 〈small bags for only 20 yuan〉.

error_sentence: Welcome to Mr. Cool's Clothes Store byu.
correct_sentence: Welcome to Mr. Cool's Clothes Store to buy.
error: byu
correction: to buy
error_type: Nonfinite Verb Form Error
error_severity: 4
error_description: ① Nonfinite Verb Form Error: According to English grammar rules, after the structure 'Welcome to...', if expressing purpose, a nonfinite verb form is required. In the original sentence, the purpose of coming to the clothing store is to buy goods, 'buy' should be changed to the infinitive 『to buy』; ② Spelling Error: According to the original sentence's meaning, it intends to express 'buy', 〈byu〉 is a spelling error, the correct spelling should be 『buy』, 〈byu〉 needs to be modified to 『buy』 to make the sentence meaning coherent.