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:
At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.

Corrected essay:
At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.

Error analysis:
error_sentence: At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.
correct_sentence: At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.
error: was
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English grammar rules, when the sensory verb 〈saw〉 is followed by an object, the ongoing action should be expressed using the present participle as an object complement. Therefore, 〈was〉 should be deleted, using 『buying』 as the nonfinite verb to form the correct structure 『saw a little girl buying』.

error_sentence: At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.
correct_sentence: At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.
error: was
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English grammar rules, when the sensory verb 〈saw〉 is followed by an object, the ongoing action should be expressed using the present participle as an object complement. Therefore, 〈was〉 should be deleted, using 『looking』 as the nonfinite verb, forming a parallel structure with the preceding phrase 『a young lady looking』.

error_sentence: At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.
correct_sentence: At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.
error: was trying
correction: trying on
error_type: Nonfinite Verb Form Error
error_severity: 5
error_description: ① Nonfinite Verb Form Error: According to English grammar rules, when the sensory verb 〈saw〉 is followed by an object, the ongoing action should be expressed using the present participle as an object complement. Therefore, 〈was〉 should be deleted, keeping 『trying』 to comply with grammar rules; ② Preposition Error: According to English expression conventions, the verb 〈trying〉 in the original sentence might be misunderstood as 'attempting', which doesn't fit the meaning. The phrasal verb 『trying on』 means 'to test clothing by putting it on', which is a fixed phrase. Missing the preposition 〈on〉 makes the meaning incomplete. Therefore, 『on』 needs to be added after 〈trying〉 to conform to English expression habits and the prompt requirements.

error_sentence: At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.
correct_sentence: At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.
correction: and
error_type: Conjunction Error
error_severity: 4
error_description: Conjunction Error: According to English grammar rules, when there are multiple parallel elements in a sentence, the last one should be preceded by the conjunction 『and』. Therefore, since 'her father was staying' acts as an object of 〈saw〉, 『and』 should be added before it to connect it with the preceding parallel elements, conforming to English expression conventions.

error_sentence: At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.
correct_sentence: At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.
error: was
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English grammar rules, when the sensory verb 〈saw〉 is followed by an object, the ongoing action should be expressed using the present participle as an object complement. Therefore, 〈was〉 should be deleted, keeping 『staying』 to comply with grammar rules.

error_sentence: At three o'clock in the afternoon, Linda saw a little girl was buying some food, a young lady was looking at a dress, her mother was trying the shoes, her father was staying on the safa waiting for them.
correct_sentence: At three o'clock in the afternoon, Linda saw a little girl buying some food, a young lady looking at a dress, her mother trying on the shoes, and her father staying on the sofa and waiting for them.
error: safa
correction: sofa and
error_type: Conjunction Error
error_severity: 5
error_description: ① Spelling Error: Based on the sentence meaning, the intended word is 'sofa'. 〈safa〉 is a misspelling of 『sofa』; it needs to be corrected to 『sofa』 for clarity; ② Conjunction Error: According to English grammar rules, parallel structures require the conjunction 『and』 to connect the last two actions. Therefore, 『and』 should be added after 『sofa』 to connect the two parallel actions, completing the sentence structure.