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:
It is seven o'clock now. Linda is helping her mother doing housework. She is washing the vegetables, her mother is cooking. Her grandparents are watching TV with her little brother. Her sister is listening to the radio, her btother is playing the computer games. They all waitting for the dinner.

Corrected essay:
It is seven o'clock now. Linda is helping her mother do housework. She is washing the vegetables, and her mother is cooking. Her grandparents are watching TV with her little brother. Her sister is listening to the radio, and her brother is playing computer games. They are all waiting for dinner.

Error analysis:
error_sentence: Linda is helping her mother doing housework.
correct_sentence: Linda is helping her mother do housework.
error: doing
correction: do
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English grammar rules, the verb 〈help〉 is typically followed by the infinitive 『do』 to indicate the purpose of the action; therefore, 〈doing〉 is changed to 『do』 to comply with grammatical rules.
error_sentence: She is washing the vegetables, her mother is cooking.
correct_sentence: She is washing the vegetables, and her mother is cooking.
correction: and
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: 〈She is washing the vegetables〉 and 〈her mother is cooking〉 each contain an independent subject-verb structure and can stand as separate sentences; therefore, the conjunction 『and』 needs to be added between the two clauses to meet grammatical requirements.
error_sentence: Her sister is listening to the radio, her btother is playing the computer games.
correct_sentence: Her sister is listening to the radio, and her brother is playing computer games.
error: her btother
correction: and her brother
error_type: Conjunction Error
error_severity: 3
error_description: ① Conjunction Error: 〈Her sister is listening to the radio〉 and 〈her brother is playing computer games〉 each contain an independent subject-verb structure and can stand as separate sentences; therefore, the conjunction 『and』 needs to be added between the two clauses to meet grammatical requirements; ② Spelling Error: According to English writing conventions, the word 〈btother〉 is misspelled and should be corrected to 『brother』 meaning 'brother'.
error_sentence: Her sister is listening to the radio, her btother is playing the computer games.
correct_sentence: Her sister is listening to the radio, and her brother is playing computer games.
error: the
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English usage, 'play computer games' is a fixed phrase meaning 'to play computer games'. Since 〈computer games〉 is plural, it does not require an article for specific reference; therefore, the redundant determiner 〈the〉 needs to be deleted to conform to English expression habits.
error_sentence: They all waitting for the dinner.
correct_sentence: They are all waiting for dinner.
error: all waitting for the
correction: are all waiting for
error_type: Auxiliary Error
error_severity: 4
error_description: ① Auxiliary Error: According to English grammar rules, the structure of the present continuous tense is subject + auxiliary verb (be) + present participle (verb-ing) + other elements. This sentence lacks the auxiliary verb 『are』 needed to form the present continuous tense, so 『are』 must be added to complete the sentence structure; ② Spelling Error: 〈waitting〉 meaning 'waiting' incorrectly doubles the 't'; the correct spelling is 『waiting』; ③ Determiner Error: In English, nouns referring to meals (breakfast, lunch, dinner) are usually not preceded by the definite article (the), so 〈the〉 is deleted to make the sentence conform to idiomatic usage.