Writing prompt: Lucy's grandmother is telling her about life several years ago. The environment where she lived has changed significantly. Using the provided hints and sentence patterns, write a short English essay about these changes.
Writing hints: different; flats; fields; bushes; buildings.
Reference sentence patterns: There was/were... ; There wasn't/weren't any... ; There was/were no...

Student essay:
Lucy, there was a big change in ten years. Ten years ago, this place were fields, there were also some bushes on it. Now there were buidings and flats in this place.

Corrected essay:
Lucy, there was a big change in the last ten years. Ten years ago, this place was a field, and there were also some bushes on it. Now there are buildings and flats in this place.

Error analysis:
error_sentence: Lucy, there was a big change in ten years.
correct_sentence: Lucy, there was a big change in the last ten years.
correction: the last
error_type: Determiner Error
error_severity: 3
error_description: Determiner Error: According to English time expression norms, 〈in ten years〉 usually indicates 'within the next ten years', while the context here requires expressing 'the state of the past ten years'; therefore, the determiner 『the last』 must be added to form the fixed phrase 『in the last ten years』, ensuring the time adverbial accurately conveys the meaning of the past time frame.

error_sentence: Ten years ago, this place were fields, there were also some bushes on it.
correct_sentence: Ten years ago, this place was a field, and there were also some bushes on it.
error: were fields,
correction: was a field, and
error_type: Conjunction Error
error_severity: 5
error_description: ① Subject-Verb Agreement Error: According to English grammar rules, the subject 〈this place〉 is third-person singular, while the verb 〈were〉 is plural, causing subject-verb disagreement; 〈were〉 needs to be changed to the singular form 『was』 to form the correct subject-verb structure 『this place was』; ② Noun Number Error: Based on the context, 〈fields〉 does not match the scope indicated by the singular subject 〈this place〉; it needs to be changed to the singular form 『field』 to maintain referential consistency, forming the reasonable expression 『this place was a field』; ③ Conjunction Error: According to English coordinating sentence structure norms, the two independent clauses 〈this place was a field〉 and 〈there were also some bushes on it〉 need to be connected by a coordinating conjunction; 『and』 needs to be added to form the complete coordinating structure.

error_sentence: Now there were buidings and flats in this place.
correct_sentence: Now there are buildings and flats in this place.
error: were buidings
correction: are buildings
error_type: Verb Tense Error
error_severity: 3
error_description: ① Verb Tense Error: According to the present time indicated by the adverb 〈Now〉, the verb 〈were〉 is in the past tense form, conflicting with the current time reference point; 〈were〉 needs to be changed to the present tense 『are』 to form the correct temporal correspondence, creating the present tense structure 〈Now there are〉; ② Spelling Error: According to English morphology, 〈buidings〉 has a spelling error; the correct spelling should be 『buildings』, which needs correction to ensure accurate noun spelling.