Writing prompt: My Favorite Sport

Student essay:
It is quite important for us to do some exercise. And now, person take part in a lot of sports. Such as running jumping and swimming. My favourite sport is playing tennis.
I often play tennis on sundays when I am free. Sometimes I play with my friends after school. Sometimes we play in the tennis club. When I play tennis, I feel happy and relax. It also makes me healthier and taller. I hope some of you can play with me!

Corrected essay:
It is quite important for us to do some exercise. And now, people take part in a lot of sports, such as running, jumping and swimming. My favourite sport is playing tennis.
I often play tennis on Sundays when I am free. Sometimes I play with my friends after school. Sometimes we play in the tennis club. When I play tennis, I feel happy and relaxed. It also makes me healthier and taller. I hope some of you can play with me!

Error analysis:
error_sentence: And now, person take part in a lot of sports.
correct_sentence: And now, people take part in a lot of sports, such as running, jumping and swimming.
error: person
correction: people
error_type: Noun Number Error
error_severity: 2
error_description: Noun Number Error: According to English countable noun usage rules, when 〈person〉 is used as a generic concept and the context involves multiple individuals (here referring to 'people participating in activities'), the plural form 『people』 must be used, forming the standard subject-verb structure 『people take part』.

error_sentence: And now, person take part in a lot of sports. Such as running jumping and swimming.
correct_sentence: And now, people take part in a lot of sports, such as running, jumping and swimming.
error: . Such
correction: , such
error_type: Punctuation Error
error_severity: 3
error_description: ① Punctuation Error: According to English exemplification expression norms, when 〈such as〉 is used as an introductory phrase for listing, the component it introduces must be connected to the main clause with a comma. Change the incorrect period to 『such as,』 to constitute the correct punctuation structure 『activities, such as』; ② Case Error: Following English capitalization rules, when 〈Such as〉 appears as a phrase not at the beginning of a sentence, it must be in all lowercase. Correct the misused capital 『Such』 to 『such』.

error_sentence: Such as running jumping and swimming.
correct_sentence: And now, people take part in a lot of sports, such as running, jumping and swimming.
correction: ,
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English list item separation rules, multiple parallel items must be separated by commas. Add a comma between 〈running〉 and 〈jumping〉 to form the standard format 『running, jumping』.

error_sentence: I often play tennis on sundays when I am free.
correct_sentence: I often play tennis on Sundays when I am free.
error: sundays
correction: Sundays
error_type: Case Error
error_severity: 1
error_description: Case Error: According to English proper noun writing conventions, the day name 〈sundays〉 as a proper noun must be capitalized. Correct to 『Sundays』 to comply with the correct writing rule for 『Sundays』.

error_sentence: When I play tennis, I feel happy and relax.
correct_sentence: When I play tennis, I feel happy and relaxed.
error: relax
correction: relaxed
error_type: PoS Confusion Error
error_severity: 3
error_description: PoS Confusion Error: According to the grammatical requirements of a copular structure, the linking verb 〈feel〉 must be followed by an adjective as a predicative. Change the verb base form 〈relax〉 to the adjective 『relaxed』 to form the correct state-expressing structure 『feel relaxed』.