Writing prompt: A Report

Student essay:
Last week our English club asked students about their weekend activities.Our question was about studying by themselves,watching TV or listening to music,playing computer games or surfing,helping with housework and exercising.We all know that it is popular to relax by watching TV or playing computer games,but we were surprised that forty percent of them study by themselves.I think it is good to study by themselves for most students,because there are so many tests for them.Then we also find out something serious-there were only ten percent of them help with housework and only five percent exercise!Although study by themselves is good,we should also help with housework and do some exercises.

Corrected essay:
Last week our English club asked students about their weekend activities. Our questions were about studying by themselves, watching TV or listening to music, playing computer games or surfing, helping with housework and exercising. We all know that it is popular to relax by watching TV or playing computer games, but we were surprised that forty percent of them study by themselves. I think it is good to study by themselves for most students, because there are so many tests for them. Then we also found out something serious—there were only ten percent of them helping with housework and only five percent exercising! Although studying by themselves is good, we should also help with housework and do some exercises.

Error analysis:
error_sentence: Our question was about studying by themselves,watching TV or listening to music,playing computer games or surfing,helping with housework and exercising.
correct_sentence: Our questions were about studying by themselves, watching TV or listening to music, playing computer games or surfing, helping with housework and exercising.
error: question was
correction: questions were
error_type: Noun Number Error
error_severity: 2
error_description: Noun Number Error: According to English grammar rules, 〈question〉 in the original sentence should be in the plural form 『questions』 to be consistent with the multiple items that follow; therefore, 〈question was〉 should be changed to 『questions were』 to comply with English grammar rules.

error_sentence: Then we also find out something serious-there were only ten percent of them help with housework and only five percent exercise!Although study by themselves is good,we should also help with housework and do some exercises.
correct_sentence: Then we also found out something serious—there were only ten percent of them helping with housework and only five percent exercising!
error: find
correction: found
error_type: Verb Tense Error
error_severity: 3
error_description: Verb Tense Error: According to the context, the sentence describes a past event and should use the simple past tense, while 〈find〉 in the original sentence is in the simple present tense; therefore, 〈find〉 needs to be changed to the simple past tense 『found』 to fit the context.

error_sentence: Then we also find out something serious-there were only ten percent of them help with housework and only five percent exercise!Although study by themselves is good,we should also help with housework and do some exercises.
correct_sentence: Then we also found out something serious—there were only ten percent of them helping with housework and only five percent exercising!
error: -
correction: —
error_type: Punctuation Error
error_severity: 2
error_description: Punctuation Error: According to English writing conventions, the hyphen 〈-〉 needs to be replaced with a standard em dash 『—』 to indicate a pause and emphasis between clauses; therefore, the hyphen 〈-〉 needs to be changed to 『—』 to make the punctuation conform to standard writing format.

error_sentence: Then we also find out something serious-there were only ten percent of them help with housework and only five percent exercise!Although study by themselves is good,we should also help with housework and do some exercises.
correct_sentence: Then we also found out something serious—there were only ten percent of them helping with housework and only five percent exercising!
error: help
correction: helping
error_type: Nonfinite Verb Form Error
error_severity: 3
error_description: Nonfinite Verb Form Error: According to English grammar rules, the verb following 〈there were〉 needs to be in the gerund form; therefore, the verb 〈help〉 in the original sentence needs to be in the gerund form 『helping』 to comply with grammar rules.

error_sentence: Then we also find out something serious-there were only ten percent of them help with housework and only five percent exercise!Although study by themselves is good,we should also help with housework and do some exercises.
correct_sentence: Then we also found out something serious—there were only ten percent of them helping with housework and only five percent exercising! Although studying by themselves is good, we should also help with housework and do some exercises.
error: exercise!Although study
correction: exercising! Although studying
error_type: Nonfinite Verb Form Error
error_severity: 5
error_description: ① Nonfinite Verb Form Error: According to English grammar rules, the verb following 〈there were〉 needs to be in the gerund form; therefore, the verb 〈exercise〉 in the original sentence needs to be in the gerund form 『exercising』 to comply with grammar rules; ② Space Error: According to English writing conventions, there should be a space between punctuation and a word, but 〈exercise!Although〉 in the original sentence lacks a space; therefore, 〈exercise!Although〉 needs to be changed to 『exercising! Although』 to conform to writing conventions; ③ Nonfinite Verb Form Error: According to English grammar rules, the preposition 〈Although〉 should be followed by a gerund form; therefore, 〈study〉 in the original sentence needs to be changed to 『studying』 to comply with grammar rules.