Writing prompt: Thanks for Parents

Student essay:
Dear mom and dad,
I'm now having the most important exam in my life.I can say nothing but thank to you both on this special occasion because words are failed when I think of the love you have shown on me.During the essential year,I spare every effort on study.So I get on well with the exam which I used to expected.I hope you can set your mind at rest.
After the exam,I will intend to do homework which I was seldom to do to help you.I would like to help cleaning first.What's more,it is cooking that I want to learn best.I mean to learn it and cook some great dishes for you.
Dear parents,everything is going on well.Don't be nervous about me!
Best wishes,yours Lihua

Corrected essay:
Dear Mom and Dad,
I'm now having the most important exam in my life. I can say nothing but thanks to you both on this special occasion because words fail me when I think of the love you have shown me. During this essential year, I spared no effort in studying. So I did well on the exam which I used to expect. I hope you can set your mind at rest.
After the exam, I intend to do housework which I seldom did to help you. I would like to help with cleaning first. What's more, it is cooking that I want to learn best. I mean to learn it and cook some great dishes for you.
Dear parents, everything is going on well. Don't be nervous about me!
Best wishes,
Yours Li Hua

Error analysis:
error_sentence: Dear mom and dad,
I'm now having the most important exam in my life.
correct_sentence: Dear Mom and Dad,
I'm now having the most important exam in my life.
error: mom and dad
correction: Mom and Dad
error_type: Case Error
error_severity: 1
error_description: Case Error: In letter salutations, kinship terms 〈mom and dad〉 when used as proper nouns require initial capitalization; therefore, it is changed to 『Mom and Dad』 to comply with English letter format requirements.
error_sentence: I can say nothing but thank to you both on this special occasion because words are failed when I think of the love you have shown on me.
correct_sentence: I can say nothing but thanks to you both on this special occasion because words fail me when I think of the love you have shown me.
error: thank
correction: thanks
error_type: PoS Confusion Error
error_severity: 3
error_description: PoS Confusion Error: According to English grammar rules, the phrase 〈say nothing but〉 should be followed by a noun as an object, whereas 〈thank〉 is a verb; therefore, it needs to be changed to the noun form 『thanks』, meaning 'gratitude'.
error_sentence: I can say nothing but thank to you both on this special occasion because words are failed when I think of the love you have shown on me.
correct_sentence: I can say nothing but thanks to you both on this special occasion because words fail me when I think of the love you have shown me.
error: are failed
correction: fail me
error_type: Verb Voice Error
error_severity: 3
error_description: ① Verb Choice Error: 〈are failed〉 is in the passive voice and its meaning does not fit the context; the active voice should be used to express the effect of the subject 〈words〉.; ② Pronoun Error: According to English grammar rules, 『me』 needs to be added as the object of the verb 'fail' to clarify the sentence meaning.
error_sentence: I can say nothing but thank to you both on this special occasion because words are failed when I think of the love you have shown on me.
correct_sentence: I can say nothing but thanks to you both on this special occasion because words fail me when I think of the love you have shown me.
error: on
error_type: Word Redundancy Error
error_severity: 4
error_description: Word Redundancy Error: According to English expression habits, 'something shown to someone' is expressed as 'show sb. sth.', without the preposition 'on' in between; therefore, 'on' in 'shown on me' is removed.
error_sentence: During the essential year,I spare every effort on study.
correct_sentence: During this essential year, I spared no effort in studying.
error: the
correction: this
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English expression habits, when referring to the current specific period, the determiner 〈this〉 should be used instead of the generic article 〈the〉; therefore, it is changed to 『this essential year』.
error_sentence: During the essential year,I spare every effort on study.
correct_sentence: During this essential year, I spared no effort in studying.
error: spare every effort on study
correction: spared no effort in studying
error_type: Verb Choice Error
error_severity: 3
error_description: ① Verb Choice Error: According to English fixed collocations, the English expression for 'spare no effort' should be 'spared no effort', not 〈spare every effort〉; therefore, 〈spare every effort〉 is changed to 『spared no effort』.; ② Preposition Error: To express 'in the field of...', 『in studying』 should be used instead of 〈on study〉.
error_sentence: So I get on well with the exam which I used to expected.
correct_sentence: So I did well on the exam which I used to expect.
error: get on well with
correction: did well on
error_type: Verb Choice Error
error_severity: 3
error_description: Verb Choice Error: According to English fixed collocations, 〈get on well with〉 mostly refers to harmonious interpersonal relationships; to describe exam performance, 『did well on』 should be used to accurately express excellent results.
error_sentence: So I get on well with the exam which I used to expected.
correct_sentence: So I did well on the exam which I used to expect.
error: expected
correction: expect
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English grammar rules, 〈used to〉 means 'formerly often did', and should be followed by the base form of the verb; therefore, the past participle 〈expected〉 is changed to 『expect』.
error_sentence: After the exam,I will intend to do homework which I was seldom to do to help you.
correct_sentence: After the exam, I intend to do housework which I seldom did to help you.
error: will
error_type: Word Redundancy Error
error_severity: 4
error_description: Word Redundancy Error: According to English grammar rules, 〈intend〉 itself already implies future intention, so there is no need to add the auxiliary verb 〈will〉; removing it makes the sentence more concise.
error_sentence: After the exam,I will intend to do homework which I was seldom to do to help you.
correct_sentence: After the exam, I intend to do housework which I seldom did to help you.
error: homework
correction: housework
error_type: Noun Error
error_severity: 3
error_description: Noun Error: According to English vocabulary meaning, 〈homework〉 refers to academic tasks, which does not fit the context; it should be changed to 『housework』 to clarify the meaning of household chores.
error_sentence: After the exam,I will intend to do homework which I was seldom to do to help you.
correct_sentence: After the exam, I intend to do housework which I seldom did to help you.
error: was seldom to do
correction: seldom did
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to English expression norms, 〈was seldom to do〉 is an ungrammatical expression; it needs to be changed to 『seldom did』 to use the past tense.
error_sentence: I would like to help cleaning first.
correct_sentence: I would like to help with cleaning first.
correction: with
error_type: Preposition Error
error_severity: 3
error_description: Preposition Error: According to English grammar rules, when the verb 〈help〉 is followed by a gerund, the preposition 『with』 needs to be added, forming the correct structure 『help with cleaning』, meaning 'help with household chores'.
error_sentence: Don't be nervous about me!

correct_sentence: Don't be nervous about me!

error: Don't
correction: Don't
error_description: No error.
error_sentence: Best wishes,yours Lihua
correct_sentence: Best wishes,
Yours Li Hua
error: yours Lihua
correction: 
Yours Li Hua
error_type: Format Error
error_severity: 4
error_description: ① Format Error: According to English writing conventions, the signature needs to be on a new line and capitalized; thus, 〈yours Lihua〉 is changed to 『 Yours Li Hua』; additionally, a comma is missing after 'Yours'.; ② Case Error: According to English writing conventions for Chinese names, the given name and surname should be written separately, and the first letter of the Pinyin should be capitalized; here, the name 〈Lihua〉 needs to be written separately as 『Li Hua』.