Writing prompt: My Favorite Teacher

Student essay:
Dear Henry,
I am glad to hear that you get on very well with your maths teacher, Mr Green.Now I'd like to tell you about my favourite teacher.
I don't like maths at all until I met Mr Green.In my opinion,maths is a very very difficult subject.I could't work out the problems and I didn't understand the ways to solve them! I always got bad marks in the texts.In fact,I was very hard-working,but I always failed.
But when I met Mr Green,everything was changed.I did badly in the first text.I was so sad that I even wanted to give up maths.But Mr Green walked to me and told me that he thought that I was a clever girl and believed I could do better. That moved me a lot.With the help of him.My maths improved quickly.
Mr Green is really kind and patient.I love him very much!

Corrected essay:
Dear Henry,
I am glad to hear that you get on very well with your maths teacher, Mr. Green. Now I'd like to tell you about my favourite teacher.
I didn't like maths at all until I met Mr. Green. In my opinion, maths is a very, very difficult subject. I couldn't work out the problems and I didn't understand the ways to solve them! I always got bad marks in the tests. In fact, I was very hard-working, but I always failed.
But when I met Mr. Green, everything was changed. I did badly on the first test. I was so sad that I even wanted to give up maths. But Mr. Green walked to me and told me that he thought that I was a clever girl and believed I could do better. That moved me a lot. With the help of him, my maths improved quickly.
Mr. Green is really kind and patient. I love him very much!

Error analysis:
error_sentence: Dear Henry,
I am glad to hear that you get on very well with your maths teacher, Mr Green.
correct_sentence: Dear Henry,
I am glad to hear that you get on very well with your maths teacher, Mr. Green.
error: Mr
correction: Mr.
error_type: Contraction Error
error_severity: 2
error_description: Contraction Error: According to English writing conventions, the abbreviation for a title 〈Mr〉 requires a period 『.』, so it is changed to 『Mr.』 to conform to standard abbreviation formats (e.g., Mr., Mrs., Dr.).

error_sentence: I don't like maths at all until I met Mr Green.
correct_sentence: I didn't like maths at all until I met Mr. Green.
error: do
correction: did
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: Based on the time adverbial 〈until I met〉 (past time reference), the main clause action should use the past tense, therefore the present simple tense 〈don't〉 is changed to the past tense 『didn't』 to maintain tense consistency.

error_sentence: I don't like maths at all until I met Mr Green.
correct_sentence: I didn't like maths at all until I met Mr. Green.
error: Mr
correction: Mr.
error_type: Contraction Error
error_severity: 2
error_description: Contraction Error: According to English writing conventions, the abbreviation for a title 〈Mr〉 requires a period 『.』, so it is changed to 『Mr.』 to conform to standard abbreviation formats (e.g., Mr., Mrs., Dr.).

error_sentence: In my opinion,maths is a very very difficult subject.
correct_sentence: In my opinion, maths is a very, very difficult subject.
correction: ,
error_type: Punctuation Error
error_severity: 2
error_description: ① Punctuation Error: When multiple adverbs modify the same component, they should be separated by a comma, therefore 〈very very〉 is changed to 『very, very』 to improve sentence fluency and readability.

error_sentence: I could't work out the problems and I didn't understand the ways to solve them!
correct_sentence: I couldn't work out the problems and I didn't understand the ways to solve them!
error: could't
correction: couldn't
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English spelling rules, 〈could't〉 is an incorrect contraction form; the correct negative contraction should be 『couldn't』 (could + not), expressing 'cannot', thus the spelling is corrected to comply with English grammar rules.

error_sentence: I always got bad marks in the texts.
correct_sentence: I always got bad marks in the tests.
error: texts
correction: tests
error_type: Noun Error
error_severity: 2
error_description: Noun Error: According to the sentence meaning, 〈texts〉 refers to 'written works', while the context actually expresses 'examinations', therefore it is replaced with the accurate noun 『tests』 to avoid ambiguity.

error_sentence: But when I met Mr Green,everything was changed.
correct_sentence: But when I met Mr. Green, everything was changed.
error: Mr
correction: Mr.
error_type: Contraction Error
error_severity: 2
error_description: Contraction Error: According to English writing conventions, the abbreviation for a title 〈Mr〉 requires a period 『.』, so it is changed to 『Mr.』 to conform to standard abbreviation formats (e.g., Mr., Mrs., Dr.).

error_sentence: I did badly in the first text.
correct_sentence: I did badly on the first test.
error: in
correction: on
error_type: Preposition Error
error_severity: 2
error_description: Preposition Error: In the fixed phrase 〈do badly in the first text.〉, the preposition should be 『on』 to indicate 'performance in a specific test', not 〈in〉, which is usually used for general areas like 'do well in math', therefore it is corrected to 『on』.

error_sentence: I did badly in the first text.
correct_sentence: I did badly on the first test.
error: text
correction: test
error_type: Noun Error
error_severity: 2
error_description: Noun Error: According to the sentence meaning, 〈texts〉 refers to 'written works', while the context actually expresses 'examinations', therefore it is replaced with the accurate noun 『tests』 to avoid ambiguity.

error_sentence: But Mr Green walked to me and told me that he thought that I was a clever girl and believed I could do better.
correct_sentence: But Mr. Green walked to me and told me that he thought that I was a clever girl and believed I could do better.
error: Mr
correction: Mr.
error_type: Contraction Error
error_severity: 2
error_description: Contraction Error: According to English writing conventions, the abbreviation for a title 〈Mr〉 requires a period 『.』, so it is changed to 『Mr.』 to conform to standard abbreviation formats (e.g., Mr., Mrs., Dr.).

error_sentence: With the help of him. My maths improved quickly.

correct_sentence: With the help of him, my maths improved quickly.

error: .My
correction: , my
error_type: Punctuation Error
error_severity: 2
error_description: ① Punctuation Error: 〈With the help of him〉 is an adverbial phrase and should be connected to the main clause with a comma, not form a separate sentence. It is changed to 『With the help of him, my...』 to ensure complete sentence structure; ② Space Error: According to English written expression norms, a word following a punctuation mark should have a space after the mark, so 〈.My〉 should be changed to 『, my』 to comply with English written expression norms; ③ Case Error: The word 〈My〉 within the clause does not require capitalization, so it is changed to lowercase 『my』 to comply with English intra-sentence capitalization rules.

error_sentence: Mr Green is really kind and patient.
correct_sentence: Mr. Green is really kind and patient.
error: Mr
correction: Mr.
error_type: Contraction Error
error_severity: 2
error_description: Contraction Error: According to English writing conventions, the abbreviation for a title 〈Mr〉 requires a period 『.』, so it is changed to 『Mr.』 to conform to standard abbreviation formats (e.g., Mr., Mrs., Dr.).