Writing prompt: My Room

Student essay:
I have a big and nice room. I am tidy. There is a table in my room. The table is near the window. There are some books on the table. And there are some pictures on the wall. They are very beautiful,. And there is a bad near the wall. There is a computer near the table. The armchair is near table. I love my room. What about your room.

Corrected essay:
I have a big and nice room. It is tidy. There is a table in my room. The table is near the window. There are some books on the table. And there are some pictures on the wall. They are very beautiful. And there is a bed near the wall. There is a computer near the table. The armchair is near the table. I love my room. What about your room?

Error analysis:
error_sentence: I am tidy.
correct_sentence: It is tidy.
error: I am
correction: It is
error_type: Subject-Verb Agreement Error
error_severity: 4
error_description: ① Pronoun Error: According to the contextual reference, the preceding subject 〈room〉 is an inanimate third-person singular noun, while 〈I am〉 mistakenly introduces a first-person pronoun. The personal pronoun 〈I〉 needs to be changed to 『It』, consistent with the antecedent, forming 『It is』 to maintain pronoun-antecedent agreement in number and person; ② Subject-Verb Agreement Error: Since the corrected subject 『It』 is in the third-person singular form, the original verb 〈am〉 does not conform to the principle of subject-verb agreement and needs to be adjusted to the third-person singular present tense form 『is』 to ensure correct grammatical structure.

error_sentence: They are very beautiful,.
correct_sentence: They are very beautiful.
error: ,
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: When the adjective 〈beautiful〉 serves as a predicative at the end of the sentence, the immediately following comma 〈,〉 violates English declarative sentence punctuation rules; it should be directly deleted, retaining the period, to form a complete declarative sentence structure 『They are very beautiful.』.

error_sentence: And there is a bad near the wall.
correct_sentence: And there is a bed near the wall.
error: bad
correction: bed
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the sentence's meaning describing room furnishings, 〈bad〉 is a misspelling of 『bed』; these are look-alike words causing confusion. It needs to be corrected to 『bed』 to accurately express the meaning of "bed," fitting the context of indoor items.

error_sentence: The armchair is near table.
correct_sentence: The armchair is near the table.
correction: the
error_type: Determiner Error
error_severity: 2
error_description: Determiner Error: The noun 〈table〉 has been clearly identified as a specific object in the preceding specific context. According to English definite article usage rules, 『the』 needs to be added to form 『near the table』 to reflect its specific reference and avoid ambiguity.

error_sentence: What about your room.
correct_sentence: What about your room?
error: .
correction: ?
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: The interrogative sentence 〈What about your room〉 has a typical interrogative structure (interrogative word + auxiliary verb). According to English interrogative sentence writing conventions, a question mark must be used at the end of the sentence, replacing the original period, to correctly mark the sentence type as 『What about your room?』.