Writing prompt: Using the given vocabulary and sentence patterns, and referring to the picture, write a short essay. It is currently 7 PM. Based on the information provided by Linda below, use the present continuous tense to describe what Linda and her family are doing. Writing hints: Linda: help mother do housework; grandparents: watch TV; brother: play computer games; mother: cook; sister: listen to the radio.

Student essay:
Linda help mother do housework. Her grandparents watch TV. Her brother plays computer games. Her mother cooks. Her sister listen to the radio

Corrected essay:
Linda is helping her mother do housework. Her grandparents are watching TV. Her brother is playing computer games. Her mother is cooking. Her sister is listening to the radio.

Error analysis:
error_sentence: Linda help mother do housework.
correct_sentence: Linda is helping her mother do housework.
error: help
correction: is helping her
error_type: Verb Tense Error
error_severity: 4
error_description: ① Verb Tense Error: According to the contextual tense requirement, the sentence needs to use the present continuous tense to indicate an ongoing action, so the auxiliary verb 『is』 should be added before the base form of the verb 〈help〉, and it should be changed to the present participle form 『is helping』 to form the correct continuous tense structure (be + V-ing); ② Determiner Error: According to English grammar rules, the common noun 〈mother〉 needs to be preceded by the possessive pronoun 『her』 to clarify the possessive relationship and avoid ambiguity. The correct structure should be 『her mother』, otherwise it may cause semantic ambiguity.
error_sentence: Her grandparents watch TV.
correct_sentence: Her grandparents are watching TV.
error: watch
correction: are watching
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to English grammar rules, the correct structure for the present continuous tense is be verb + present participle. Since the subject 〈grandparents〉 is plural, the corresponding be verb should be the plural form 『are』, and the base form of the verb 〈watch〉 should be changed to the present participle 『watching』. Therefore, the overall modification is to 『are watching』 to meet the requirements of tense and subject-verb agreement.
error_sentence: Her brother plays computer games.
correct_sentence: Her brother is playing computer games.
error: plays
correction: is playing
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to English grammar rules, when the subject is third-person singular and indicates an ongoing action, the correct structure for the present continuous tense should be be verb (is) + present participle (V-ing). The verb 〈plays〉 in the original sentence is the third-person singular form of the simple present tense, which does not meet the requirement for the continuous tense. Therefore, the auxiliary verb 『is』 needs to be added before the verb, and the base form of the verb should be changed to the present participle form 『playing』, finally correcting it to 『is playing』 to ensure the correctness of tense and subject-verb agreement.
error_sentence: Her mother cooks.
correct_sentence: Her mother is cooking.
error: cooks
correction: is cooking
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to English grammar rules, the present continuous tense should use the structure 『be verb + present participle』. The subject of the original sentence is third-person singular, therefore the base form of the verb 〈cooks〉 is changed to 『is cooking』.
error_sentence: Her sister listen to the radio
correct_sentence: Her sister is listening to the radio.
error: listen
correction: is listening
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to English grammar rules, the present continuous tense indicates an action currently happening and requires the structure 『be verb + present participle』. The verb 〈listen〉 in the original sentence is the base form, which does not meet the requirement for the continuous tense, so it is modified to 『is listening』, where 『is』 is the third-person singular present tense auxiliary verb, and 『listening』 is the present participle form, together forming the present continuous structure.
error_sentence: Her sister listen to the radio
correct_sentence: Her sister is listening to the radio.
correction: .
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English writing conventions, a declarative sentence must end with a period. The original sentence lacks a terminal punctuation mark, so a 『.』 needs to be added at the end of the sentence to conform to standard English sentence structure. This modification ensures the grammatical integrity of the sentence and makes the expression comply with the punctuation rules of written English.