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:
At seven o'clock, linda's family are doing thing. Linda is doing help her mother do housework. Her grandparents are watchng TV now. Her brother is playing computer games. Her mother is cooking now. Her sister is listening to the radio.

Corrected essay:
At seven o'clock, Linda's family are doing things. Linda is helping her mother do housework. Her grandparents are watching TV now. Her brother is playing computer games. Her mother is cooking now. Her sister is listening to the radio.

Error analysis:
error_sentence: At seven o'clock, linda's family are doing thing.
correct_sentence: At seven o'clock, Linda's family are doing things.
error: linda
correction: Linda
error_type: Case Error
error_severity: 1
error_description: ① Case Error: According to English writing conventions, the first letter of a proper noun, such as a person's name, must be capitalized. The first letter of 〈linda〉 in the sentence is not capitalized and should be changed to 『Linda』 to comply with English writing standards.
error_sentence: At seven o'clock, linda's family are doing thing.
correct_sentence: At seven o'clock, Linda's family are doing things.
error: thing
correction: things
error_type: Noun Number Error
error_severity: 3
error_description: ① Noun Number Error: According to English grammar rules, countable nouns must be in plural form when expressing plural concepts such as multiple things or activities. In this sentence, 〈Linda's family are doing〉 indicates that the family members are engaged in multiple activities. As a countable noun, 〈thing〉 should represent a plural concept here, so it should be changed to the plural form 『things』.
error_sentence: Linda is doing help her mother do housework.
correct_sentence: Linda is helping her mother do housework.
error: doing help
correction: helping
error_type: Verb Choice Error
error_severity: 3
error_description: ① Verb Choice Error: According to the sentence meaning, the intention is to express 'is helping her mother do housework'. In the present continuous tense structure, 〈help〉 itself can directly serve as the main verb, and the incorrect verb phrase 〈doing help〉 is unnecessary. Furthermore, the verb-object structure 〈doing help〉 is complete and cannot take the object 〈her mother〉. Therefore, this is a verb choice error, and 〈doing help〉 should be changed to the transitive verb 『helping』 to comply with grammatical rules.
error_sentence: Her grandparents are watchng TV now.
correct_sentence: Her grandparents are watching TV now.
error: watchng
correction: watching
error_type: Spelling Error
error_severity: 2
error_description: ① Spelling Error: According to the sentence meaning, the intention is to express 'Her grandparents are watching TV now'. The spelling 'watchng' does not conform to the spelling rule for the present participle of 'watch'; it is missing the letter 『i』. It should be changed to 『watching』 to match the correct spelling and sentence meaning.