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:
I made many plans for this weekend. In the Saturday morning , I am going to finish my homework. In the Saturday afternoon , I am going to do clean with my mother . And I am going to visit my grandparents in the Sunday noon. After that, we are going to fly a kite. I think in this weekend we will have a good time!

Corrected essay:
I made many plans for this weekend. On Saturday morning, I am going to finish my homework. On Saturday afternoon, I am going to clean with my mother. And I am going to visit my grandparents on Sunday at noon. After that, we are going to fly a kite. I think this weekend we will have a good time!

Error analysis:
error_sentence: In the Saturday morning , I am going to finish my homework.
correct_sentence: On Saturday morning, I am going to finish my homework.
error: In the
correction: On
error_type: Word Redundancy Error
error_severity: 2
error_description: ① Preposition Error: According to English preposition rules for time, 〈In〉 is used for longer periods (like seasons/months), while a specific morning of a day requires 『On』. Therefore, 〈In the Saturday morning〉 is corrected to 『On Saturday morning』, aligning with the standard structure "on + specific date + morning" and accurately indicating "Saturday morning"; ② Word Redundancy Error: When 〈Saturday morning〉 functions as a specific time adverbial, it does not require an article, so the redundant 〈the〉 is deleted, finally correcting it to the time adverbial 『On Saturday morning』.
error_sentence: In the Saturday afternoon , I am going to do clean with my mother .
correct_sentence: On Saturday afternoon, I am going to clean with my mother.
error: In the
correction: On
error_type: Word Redundancy Error
error_severity: 2
error_description: ① Preposition Error: According to English preposition rules for time, 〈In〉 is used for longer periods (like seasons/months), while a specific afternoon of a day requires 『On』. Therefore, 〈In the Saturday afternoon〉 is corrected to 『On Saturday afternoon』, aligning with the standard structure "on + specific date + afternoon" and accurately indicating "Saturday afternoon"; ② Word Redundancy Error: When 〈Saturday afternoon〉 functions as a specific time adverbial, it does not require an article, so the redundant 〈the〉 is deleted, finally correcting it to the time adverbial 『On Saturday afternoon』.
error_sentence: In the Saturday afternoon , I am going to do clean with my mother .
correct_sentence: On Saturday afternoon, I am going to clean with my mother.
error: do
error_type: Word Redundancy Error
error_severity: 2
error_description: Word Redundancy Error: According to English collocation principles, the auxiliary verb 〈do〉 is usually not used with the specific action verb 〈clean〉 to express the action of cleaning. Therefore, the redundant auxiliary verb phrase 〈do clean〉 is modified to the single verb 『clean』 to conform to English verb usage norms.
error_sentence: And I am going to visit my grandparents in the Sunday noon.
correct_sentence: And I am going to visit my grandparents on Sunday at noon.
error: in the Sunday
correction: on Sunday at
error_type: Word Redundancy Error
error_severity: 3
error_description: ① Preposition Error: According to English time expression rules, the preposition 〈In〉 is used for general longer periods (e.g., seasons, years), while 『On』 is used for specific dates or days of the week. Therefore, the preposition in the incorrect phrase 〈in the Sunday〉 is changed to 『on』 to accurately represent the day of the week concept; ② Word Redundancy Error: According to English grammar rules, names of the days of the week are typically not preceded by an article. Thus, the redundant definite article 〈the〉 in 〈the Sunday〉 is deleted, finally modifying it to 『on Sunday』; ③ Preposition Error: According to time expression norms, specific clock times or fixed points in time (such as noon) require the preposition 『at』. Therefore, the missing preposition 『at』 is added before 〈noon〉, changing 〈noon〉 to 『at noon』 to conform to English time expression customs.
error_sentence: I think in this weekend we will have a good time!
correct_sentence: I think this weekend we will have a good time!
error: in
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: According to English time expression norms, the preposition 〈in〉 is used for general longer periods (such as months, seasons, or years), while the demonstrative pronoun 〈this〉 used with a time noun (like 〈weekend〉) does not require an additional preposition. Therefore, the redundant preposition 〈in〉 in 〈in this weekend〉 is deleted, using 『this weekend』 directly to conform to standard English usage.