Writing prompt: My Favorite Place at School

Student essay:
There are many places in our school,for example:the playground,the experiment. But my favourite place at school is the classroom,classroom the place of study. We can learn a lot of knowledge,the classroom is the place where we are most often. So the classroom is my favourite place at school.

Corrected essay:
There are many places in our school, for example, the playground and the experiment room. But my favourite place at school is the classroom. The classroom is the place of study. We can learn a lot of knowledge. The classroom is the place where we are most often. So the classroom is my favourite place at school.

Error analysis:
error_sentence: There are many places in our school,for example:the playground,the experiment.
correct_sentence: There are many places in our school, for example, the playground and the experiment room.
error: :
correction: ,
error_type: Punctuation Error
error_severity: 2
error_description: ① Space Error: According to English writing conventions, a space should be kept between a punctuation mark (comma or period) and the following word, thus a space needs to be added and changed to 『, for example』; ② Punctuation Error: According to English writing conventions, the use of 〈:〉 in 〈for example:〉 does not conform to English usage; it should be changed to a comma and a character space added, changed to 『, 』 to correctly represent the separation of the example.
error_sentence: There are many places in our school,for example:the playground,the experiment.
correct_sentence: There are many places in our school, for example, the playground and the experiment room.
error: ,
correction: and
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: According to English expression habits, when listing multiple places in parallel, a conjunction is needed between the last two items; the last comma in 〈the playground,the experiment room〉 should be changed to the conjunction 『and』 to form a standard parallel structure.
error_sentence: There are many places in our school,for example:the playground,the experiment.
correct_sentence: There are many places in our school, for example, the playground and the experiment room.
correction: room
error_type: Noun Error
error_severity: 3
error_description: Noun Error: When 〈the experiment〉 is used as a place name, it lacks a specific modifier to clarify the place concept, so 『room』 is added to make it 『experiment room』, which is more in line with expression habits and semantic completeness.
error_sentence: But my favourite place at school is the classroom,classroom the place of study.
correct_sentence: But my favourite place at school is the classroom. The classroom is the place of study.
error: ,classroom
correction: . The classroom is
error_type: Sentence Structure Error
error_severity: 5
error_description: ① Punctuation Error: A comma is misused to join two independent clauses 〈But my favourite...〉 and 〈classroom the place...〉; a period 『.』 should be used for separation; ② Space Error: According to English writing conventions, a space should be kept between a punctuation mark (comma or period) and the following word, thus a space needs to be added and changed to 『. The』; ③ Determiner Error: The definite article 『The』 needs to be added before the singular countable noun 〈classroom〉; ④ Sentence Structure Error: The original sentence 〈The classroom the place of study〉 lacks a predicate verb; 『is』 needs to be added to form a complete subject-copula-predicative structure.
error_sentence: We can learn a lot of knowledge,the classroom is the place where we are most often.
correct_sentence: We can learn a lot of knowledge. The classroom is the place where we are most often.
error: ,the
correction: . The
error_type: Punctuation Error
error_severity: 1
error_description: ① Punctuation Error: According to English expression habits, a comma is misused to join two independent clauses 〈We can learn...〉 and 〈the classroom is...〉; a period 『.』 should be used for separation to avoid a run-on sentence; ② Space Error: According to English writing conventions, a space should be kept between a punctuation mark (comma or period) and the following word, thus a space needs to be added and changed to 『. The』.