Writing prompt: The weekend is coming. Classmates, what are you planning to do? Using the given vocabulary and sentence patterns, and referring to the picture, write a short essay of about 60 words about your plans for the weekend.
Writing hints: be going to; do cleaning; visit grandparents; have a good time

Student essay:
In the weekend. I do my homework by myself. And i help my mother do housework. I visit my grandparent with my parents. Finally, we go to park fly kite.

Corrected essay:
At the weekend, I am going to do my homework by myself. And I am going to help my mother do housework. I am going to visit my grandparents with my parents. Finally, we are going to go to the park to fly a kite.

Error analysis:
error_sentence: In the weekend.
correct_sentence: At the weekend, I am going to do my homework by myself.
error: In
correction: At
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: According to English grammar rules, the preposition 『At』 is used to indicate specific periods of time, while 〈In〉 is used for larger time frames; in the original sentence, 〈the weekend〉 is a specific period of time, so 〈In〉 is changed to 『At』 to conform to English expression habits.
error_sentence: In the weekend. I do my homework by myself.
correct_sentence: At the weekend, I am going to do my homework by myself.
error: . I
correction: , I am going to
error_type: Verb Tense Error
error_severity: 4
error_description: ① Punctuation Error: According to English expression habits, the time adverbial 〈In the weekend〉 at the beginning of the sentence must be connected to the following main clause with a comma, so the period 『.』 needs to be changed to a comma 『,』 to comply with English punctuation usage rules.; ② Verb Tense Error: According to the context and prompts, the sentence describes planned future activities and should use the simple future tense; the original sentence uses 〈do〉 in the simple present tense, which is a tense error, so 〈do〉 needs to be changed to 『am going to do』 to indicate a planned future action, in line with the context.
error_sentence: And i help my mother do housework.
correct_sentence: And I am going to help my mother do housework.
error: i
correction: I am going to
error_type: Verb Tense Error
error_severity: 4
error_description: ① Case Error: According to English writing conventions, the first-person pronoun 〈i〉 should always be capitalized as 『I』; therefore, 〈i〉 is changed to 『I』 to comply with writing conventions.; ② Verb Tense Error: According to the context and prompts, the sentence describes planned future activities and should use the simple future tense; the original sentence uses 〈help〉 in the simple present tense, which is a tense error, so 〈help〉 needs to be changed to 『am going to help』 to indicate a planned future action, in line with the context.
error_sentence: I visit my grandparent with my parents.
correct_sentence: I am going to visit my grandparents with my parents.
correction: am going to
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to the context and prompts, the sentence describes planned future activities and should use the simple future tense; the original sentence uses 〈visit〉 in the simple present tense, which is a tense error, so 〈visit〉 needs to be changed to 『am going to visit』 to indicate a planned future action, in line with the context.
error_sentence: I visit my grandparent with my parents.
correct_sentence: I am going to visit my grandparents with my parents.
error: grandparent
correction: grandparents
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: According to the task requirements, one is to “visit grandparents,” so the plural form of the noun should be used; however, 〈grandparent〉 in the original sentence is singular, so 〈grandparent〉 needs to be changed to 『grandparents』 to be consistent with the task requirements.
error_sentence: Finally, we go to park fly kite.
correct_sentence: Finally, we are going to go to the park to fly a kite.
correction: are going to
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to the context and prompts, the sentence describes planned future activities and should use the simple future tense; the original sentence uses 〈go〉 in the simple present tense, which is a tense error, so 〈go〉 needs to be changed to 『are going to go』 to indicate a planned future action, in line with the context.
error_sentence: Finally, we go to park fly kite.
correct_sentence: Finally, we are going to go to the park to fly a kite.
error: park fly
correction: the park to fly a
error_type: Nonfinite Verb Form Error
error_severity: 5
error_description: ① Determiner Error: According to English grammar rules, the place noun 〈park〉 in the original sentence should be a specific location, thus requiring the definite article 『the』 before 〈park〉 to indicate specificity, i.e., changed to 『to the park』, to comply with English grammar rules.; ② Nonfinite Verb Form Error: According to English expression habits, an infinitive is needed to express an adverbial of purpose; in the original sentence, 〈fly〉 is in its base form, so 〈fly〉 needs to be changed to 『to fly』 to connect the purpose of the action, in line with expression habits.; ③ Determiner Error: According to English expression habits, when mentioning 〈kite〉 for the first time, the indefinite article 『a』 should be used instead of the definite article 〈the〉, so 〈the〉 is changed to 『a』 to conform to English habits.