Writing prompt: We Have Only One Earth

Student essay:
We have only one Earth,so please protect it. But people are doing something to hurt the Earth. People always catch a lot of fish. Put dirty water into the sea and river. It can pollute water and kill lots of fish. People throw a lot of rubbish. It pollutes the land and animals become fewer and fewer. Some people destroy forest and animals family. We should take good care of our family. Without trees,we cannot have fresh air. Without water,we cannot live in any place. Without enough air,we cannot live. So,we should protect our family. We have only one Earth.

Corrected essay:
We have only one Earth, so please protect it. But people are doing something to hurt the Earth. People always catch a lot of fish and put dirty water into the sea and rivers, which pollutes water and kills lots of fish. People throw a lot of rubbish. It pollutes the land and animals become fewer and fewer. Some people destroy forests and animals' families. We should take good care of our Earth. Without trees, we cannot have fresh air. Without water, we cannot live in any place. Without enough air, we cannot live. So, we should protect our Earth. We have only one Earth.

Error analysis:
error_sentence: People always catch a lot of fish. Put dirty water into the sea and river.
correct_sentence: People always catch a lot of fish and put dirty water into the sea and rivers, which pollutes water and kills lots of fish.
error: . Put
correction: and put
error_type: Conjunction Error
error_severity: 3
error_description: Conjunction Error: The two actions 〈catch〉 and 〈put〉 in the sentence need to be connected by the conjunction 『and』, therefore 〈. Put〉 is changed to 『and put』 to make the sentence coherent.

error_sentence: Put dirty water into the sea and river. It can pollute water and kill lots of fish.
correct_sentence: People always catch a lot of fish and put dirty water into the sea and rivers, which pollutes water and kills lots of fish.
error: river. It can pollute
correction: rivers, which pollutes
error_type: Sentence Structure Error
error_severity: 4
error_description: ① Noun Number Error: The plural form should be used here to match the plural logic of seas, so 〈river〉 is changed to 『rivers』 to conform to grammatical rules; ② Sentence Structure Error: Considering the context, the intended meaning is 'People always catch a lot of fish and put dirty water into the sea and rivers, which pollutes water and kills lots of fish'. The independent clauses 〈Put dirty water...〉 and 〈It can pollute...〉 should be changed to a non-restrictive relative clause, therefore 〈. It can pollute〉 is changed to 『, which pollutes』 to conform to grammatical rules.

error_sentence: It can pollute water and kill lots of fish.
correct_sentence: People always catch a lot of fish and put dirty water into the sea and rivers, which pollutes water and kills lots of fish.
error: kill
correction: kills
error_type: Subject-Verb Agreement Error
error_severity: 3
error_description: Subject-Verb Agreement Error: The relative pronoun 〈which〉 refers to the preceding singular event as a whole, so the verb needs to be in the third-person singular form, therefore 〈kill〉 is changed to 『kills』 to comply with subject-verb agreement rules.

error_sentence: Some people destroy forest and animals family.
correct_sentence: Some people destroy forests and animals' families.
error: forest
correction: forests
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: The plural form should be used here to match the context indicating multiple forests, therefore 〈forest〉 is changed to 『forests』 to conform to grammatical rules.

error_sentence: Some people destroy forest and animals family.
correct_sentence: Some people destroy forests and animals' families.
error: family
correction: ' families
error_type: Noun Possessive Error
error_severity: 4
error_description: ① Noun Possessive Error: Considering the context, the intended meaning is 'animals' habitats', so 『'』 is added after 〈animals〉 to correctly express the meaning; ② Noun Number Error: The plural form is needed here to match the diversity of animal groups, so 〈family〉 is changed to 『families』 to conform to grammatical rules.

error_sentence: We should take good care of our family.
correct_sentence: We should take good care of our Earth.
error: family
correction: Earth
error_type: Noun Error
error_severity: 3
error_description: Noun Error: The preceding text discusses Earth protection, here 〈family〉 is semantically inappropriate, therefore 〈family〉 is changed to 『Earth』 to reinforce the main theme of the article.

error_sentence: So,we should protect our family.
correct_sentence: So, we should protect our Earth.
error: family
correction: Earth
error_type: Noun Error
error_severity: 3
error_description: Noun Error: The preceding text discusses Earth protection, here 〈family〉 is semantically inappropriate, therefore 〈family〉 is changed to 『Earth』 to reinforce the main theme of the article.