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. cools Clothes Store has a sale. It's very cheap. All kinds of sweathers only sells 30 yuan. Pants only sells 20 yuan. Shirts only sells 25 yuan. Large handbag only sells 35 yuan. Small bag only sells 20 yuan. And there are lots of shoes and skirts. Welcome to buy it. !

Corrected essay:
Mr. Cool's Clothes Store has a sale. It's very cheap. All kinds of sweaters only sell for 30 yuan. Pants only sell for 20 yuan. Shirts only sell for 25 yuan. Large handbags only sell for 35 yuan. Small bags only sell for 20 yuan. And there are lots of shoes and skirts. Welcome to buy them!

Error analysis:
error_sentence: Mr. cools Clothes Store has a sale.
correct_sentence: Mr. Cool's Clothes Store has a sale.
error: cools
correction: Cool's
error_type: Noun Possessive Error
error_severity: 3
error_description: ① Noun Possessive Error: In English, to express possession, "'s" is added after a person's name to form the possessive case. The original sentence mentions “Mr. Cool's Clothes Store”, but using 〈cools〉 here does not show possession and cannot indicate the store's ownership, which is a noun possessive error. 〈cools〉 should be changed to 『Cool's』 to correctly express the store's ownership; ② Case Error: According to English writing conventions, proper nouns like names must be capitalized. In the original sentence, the first letter of 〈cool〉 is not capitalized, which does not conform to the rules. The first letter should be capitalized as 『Cool』 to comply with English rules.

error_sentence: All kinds of sweathers only sells 30 yuan.
correct_sentence: All kinds of sweaters only sell for 30 yuan.
error: sweathers only sells
correction: sweaters only sell for
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Spelling Error: Based on the sentence meaning, the intention is to express 'all kinds of sweaters sell for only 30 yuan'. 〈sweathers〉 is a misspelling of 『sweaters』 and needs to be corrected to 『sweaters』 to conform to English writing norms; ② Subject-Verb Agreement Error: According to English subject-verb agreement rules, a plural subject requires the verb to be in the plural form. In the original phrase 'sweathers only sells', the subject 'sweathers' (though misspelled) is plural, but the verb 'sells' is in the third-person singular form, resulting in disagreement. 〈sells〉 should be changed to 『sell』; ③ Preposition Error: According to English grammar rules, when indicating the price of an item, the verb 'sell' is often followed by the preposition 'for'. The original sentence lacks the preposition 〈for〉, which is a preposition error. 『for』 should be added to make the sentence's meaning 'all kinds of sweaters sell for only 30 yuan' complete and accurate.

error_sentence: Pants only sells 20 yuan.
correct_sentence: Pants only sell for 20 yuan.
error: sells
correction: sell for
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Subject-Verb Agreement Error: According to English subject-verb agreement rules, a plural subject requires the verb to be in the plural form. In the original sentence, 〈pants〉 is plural, but the verb 'sells' is in the third-person singular form, resulting in disagreement, which is a subject-verb agreement error. 〈sells〉 should be changed to 『sell』; ② Preposition Error: In English, when indicating the price of an item, the verb 'sell' is often followed by the preposition 'for'. The original sentence lacks 〈for〉, which is a preposition error. 『for』 should be added to make the sentence expression accurate.

error_sentence: Shirts only sells 25 yuan.
correct_sentence: Shirts only sell for 25 yuan.
error: sells
correction: sell for
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Subject-Verb Agreement Error: According to English subject-verb agreement rules, a plural subject requires the verb to be in the plural form. In the original sentence, 〈shirts〉 is plural, but the verb 'sells' is in the third-person singular form, resulting in disagreement, which is a subject-verb agreement error. 〈sells〉 should be changed to 『sell』; ② Preposition Error: In English, when indicating the price of an item, the verb 'sell' is often followed by the preposition "for". The original sentence lacks 〈for〉, which is a preposition error. 『for』 should be added to make the sentence expression accurate.

error_sentence: Large handbag only sells 35 yuan.
correct_sentence: Large handbags only sell for 35 yuan.
error: handbag only sells
correction: handbags only sell for
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Noun Number Error: Singular countable nouns cannot represent a category alone; 〈Large handbag〉 should be changed to the plural form 『Large handbags』 to match the context implying multiple handbags; ② Subject-Verb Agreement Error: English grammar dictates that a plural subject requires the verb to be in the plural form. In the original sentence, 'Large handbags' is plural, but the verb 'sells' is in the third-person singular form, resulting in disagreement, which is a subject-verb agreement error. 〈sells〉 needs to be changed to 『sell』; ③ Preposition Error: In English, when the verb 'sell' is followed by a price, it is customary to use the preposition 'for' to indicate 'sell at the price of...'. The original sentence lacks 'for', which is a preposition error. 『for』 should be added to make the sentence semantically complete.

error_sentence: Small bag only sells 20 yuan.
correct_sentence: Small bags only sell for 20 yuan.
error: bag only sells
correction: bags only sell for
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Noun Number Error: Judging from the context, this refers to multiple small bags, so 'bag' should be in the plural form 'bags'. Using 'bag' in the original sentence does not fit the context, which is a noun number error. 〈bag〉 needs to be changed to 『bags』; ② Subject-Verb Agreement Error: According to English subject-verb agreement rules, a plural subject requires the verb to be in the plural form. In the original sentence, 'Small bags' refers to multiple bags, making it a plural subject, but the verb 'sells' is in the third-person singular form, resulting in disagreement, which is a subject-verb agreement error. 〈sells〉 needs to be changed to 『sell』; ③ Preposition Error: According to English expression conventions, when the verb 'sell' is followed by a price, the preposition 'for' should be used to indicate 'sell at the price of...'. The original sentence lacks 'for', which is a preposition error. 『for』 should be added to make the sentence semantically complete.

error_sentence: Welcome to buy it. !
correct_sentence: Welcome to buy them!
error: it.
correction: them
error_type: Pronoun Error
error_severity: 3
error_description: ① Pronoun Error: According to English grammar rules, pronouns must agree in number with the nouns they refer to. In the original sentence, the pronoun 〈it〉 is singular and cannot refer to the preceding plural nouns 〈shoes and skirts〉, which is a pronoun error. 〈it〉 should be changed to the plural pronoun 『them』 to achieve number agreement and make the sentence meaning accurate; ② Punctuation Error: According to English writing conventions, only one punctuation mark is needed at the end of a sentence, except for direct quotes. Therefore, the period here is redundant. Since this is an exclamatory sentence, only the original exclamation mark should be kept.