Writing prompt: Using the given vocabulary and sentence patterns, and referring to the picture, write a short essay. It is 3 PM. Based on the information provided below about Linda, use the present continuous tense to describe what Linda sees and hears at the mall:
Writing hints:
A little girl: buy some food
A young lady: look at a dress
Linda's mother: try on the shoes
Linda's father: stay on the sofa; wait for

Student essay:
A little girl is buying some food, a young lady is looking at a dress, Linda's mother is trying the shoes, Linda's father is staying on the sofa and waiting for.

Corrected essay:
A little girl is buying some food, a young lady is looking at a dress. Linda's mother is trying on the shoes, and Linda's father is staying on the sofa and waiting.

Error analysis:
error_sentence: A little girl is buying some food, a young lady is looking at a dress, Linda's mother is trying the shoes, Linda's father is staying on the sofa and waiting for.
correct_sentence: A little girl is buying some food, a young lady is looking at a dress.
error: ,
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English grammar rules, the original sentences 〈A little girl is buying some food〉 and 〈a young lady is looking at a dress〉 are two independent clauses and should be separated by a 『.』; therefore, 〈,〉 needs to be replaced with 『.』 to make the sentence structure correct.
error_sentence: A little girl is buying some food, a young lady is looking at a dress, Linda's mother is trying the shoes, Linda's father is staying on the sofa and waiting for.
correct_sentence: Linda's mother is trying on the shoes, and Linda's father is staying on the sofa and waiting.
correction: on
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English expression habits, the verb 〈trying〉 in the original sentence could be misunderstood as “attempting,” which does not fit the meaning; the phrasal verb “try on” means “to test clothing by putting it on,” which is a fixed phrase. Missing the preposition 『on』 would lead to an incomplete meaning, so 『on』 needs to be added after 〈trying〉 to conform to English expression habits and the prompt's requirements.
error_sentence: A little girl is buying some food, a young lady is looking at a dress, Linda's mother is trying the shoes, Linda's father is staying on the sofa and waiting for.
correct_sentence: Linda's mother is trying on the shoes, and Linda's father is staying on the sofa and waiting.
correction: and
error_type: Conjunction Error
error_severity: 4
error_description: Conjunction Error: According to English grammar rules, the clauses 〈Linda's mother is trying the shoes〉 and 〈Linda's father is staying on the sofa〉 have complete subject-verb structures and are parallel structures, requiring the conjunction 『and』 to connect them, in line with English expression habits.
error_sentence: A little girl is buying some food, a young lady is looking at a dress, Linda's mother is trying the shoes, Linda's father is staying on the sofa and waiting for.
correct_sentence: Linda's mother is trying on the shoes, and Linda's father is staying on the sofa and waiting.
error: for
error_type: Word Redundancy Error
error_severity: 4
error_description: Word Redundancy Error: According to English expression habits, the verb 〈waiting〉 does not require the preposition 〈for〉 when there is no object; in the original sentence, 〈for〉 is redundant in this context. Deleting it does not affect the sentence's meaning, so 〈waiting for〉 is simplified to 『waiting』 to enhance conciseness.