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 on sale now. It has a great price. It's only 30 yuan for sweathers in any color. It's only 20 for shorts. It's only 25 yuan for shirts. Big handbags are 35 yuan whille 20 yuan for small ones. There are many beautiful shoes and dresses. Welcome to our store.

Corrected essay:
Mr. Cool's Clothes Store is having a sale now. They have great prices. It's only 30 yuan for sweaters in any color. It's only 20 yuan for shorts. It's only 25 yuan for shirts. Big handbags sell for 35 yuan while 20 yuan for small ones. There are many beautiful shoes and dresses. Welcome to our store.

Error analysis:
error_sentence: Mr. Cool's Clothes Store is on sale now.
correct_sentence: Mr. Cool's Clothes Store is having a sale now.
error: on
correction: having a
error_type: Verb Choice Error
error_severity: 3
error_description: Verb Choice Error: In English, when expressing commercial promotional activities, 〈have a sale〉 is a fixed verb phrase emphasizing the store's active initiation of the promotion, logically corresponding with the adverb of time 'now'. In contrast, 〈is on sale〉, as a linking verb structure, emphasizes a long-term state, creating a tense conflict when paired with 'now', failing to accurately convey the dynamic scene of 'the store is currently holding a promotion'. It should be replaced with the phrase containing a dynamic verb 『have a sale』. Therefore, the corrected sentence should be 『Mr. Cool's Clothes Store is having a sale now. 』.

error_sentence: It has a great price.
correct_sentence: They have great prices.
error: It has a great price
correction: They have great prices
error_type: Subject-Verb Agreement Error
error_severity: 5
error_description: ① Pronoun Error: Although the preceding subject 〈Mr. Cool's Clothes Store〉 is a singular store name, in English commercial context, the plural pronoun 『They』 is typically used to refer to its collective staff or product collection (rather than the singular pronoun 〈It〉 referring to the physical building); ② Subject-Verb Agreement Error: When using the plural pronoun 『They』 as the subject, the predicate verb must maintain number agreement. Therefore, the singular form of the predicate verb 〈has〉 in this sentence needs to be corrected to the plural form 『have』, forming the correct structure 『They have』; ③ Noun Number Error: In the context of a store, multiple product pricing systems are usually involved. Therefore, when referring generally, the plural form 『prices』 (emphasizing the diversity of different products/prices) should be used, not the singular 〈price〉 (which could be easily understood as a single product price or total price concept). Additionally, the redundant article 〈a〉 should be deleted to comply with plural noun usage rules.

error_sentence: It's only 30 yuan for sweathers in any color.
correct_sentence: It's only 30 yuan for sweaters in any color.
error: sweathers
correction: sweaters
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the original sentence, the intended meaning is 'sweaters in any color'. The word in the original sentence contains a spelling error. Therefore, 〈sweathers〉 should be changed to 『sweaters』 to correctly express the meaning.

error_sentence: It's only 20 for shorts.
correct_sentence: It's only 20 yuan for shorts.
correction: yuan
error_type: Noun Error
error_severity: 3
error_description: Noun Error: In the context of expressing product prices, the number 〈20〉 as a cardinal number must be paired with a clear currency unit to form a complete price expression. The absence of the price unit 『yuan』 leads to semantic ambiguity, potentially causing readers to misjudge the currency type (e.g., dollars, euros, etc.) or question the nature of the value (e.g., whether it refers to a discount percentage, points value, etc.). According to English grammar rules, when a numerical value is used with a currency unit, the unit noun cannot be omitted. Thus, 『yuan』 should be added after 〈20〉 here.

error_sentence: Big handbags are 35 yuan whille 20 yuan for small ones.
correct_sentence: Big handbags sell for 35 yuan while 20 yuan for small ones.
error: are
correction: sell for
error_type: Verb Choice Error
error_severity: 3
error_description: Verb Choice Error: In English expression, when describing product pricing, 〈are〉 merely statically states the objective existence that 'Big handbags are 35 yuan'. However, in a commercial context, the transaction attribute needs to be clearly expressed. 『sell for』 dynamically emphasizes the 'selling price' of the goods through a verb phrase, which better fits the contextual logic. Therefore, 〈are〉 here needs to be changed to 『sell for』.

error_sentence: Big handbags are 35 yuan whille 20 yuan for small ones.
correct_sentence: Big handbags sell for 35 yuan while 20 yuan for small ones.
error: whille
correction: while
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: From the original sentence, the intention here is to 'contrast the prices of large and small bags', connected by 『while』. It is thus evident that the word 〈whille〉 has a spelling error involving a redundant letter; the correct spelling should be the conjunction 『while』.