Writing prompt: Using the knowledge from this unit, introduce the animal in the picture below.
Writing hints:
This is a ...
What colour is it? It's...
Its ... is/are...

Student essay:
Hi'm tony. That it's rabbit. It is little and thin my friend home have a rabbit. It eat grass. But l don't like rabbit. What about you?

Corrected essay:
Hi, I'm Tony. That is a rabbit. It is little and thin. My friend has a rabbit at home. It eats grass. But I don't like rabbits. What about you?

Error analysis:
error_sentence: Hi'm tony.
correct_sentence: Hi, I'm Tony.
error: Hi'm tony
correction: Hi, I'm Tony
error_type: Punctuation Error
error_severity: 4
error_description: ① Punctuation Error: According to English letter format conventions, when the greeting 〈Hi〉 is used as an independent element, it must be followed by a comma 〈,〉 to indicate a pause, thus it is changed to 『Hi,』 to comply with English punctuation rules; ② Contraction Error: According to English grammar rules, the first-person pronoun 〈i〉 must always be capitalized, therefore the contraction 〈i'm〉 is corrected to 『I'm』 to maintain the consistency of pronoun capitalization; ③ Spelling Error: According to English proper noun writing conventions, the name 〈tony〉 must be capitalized, thus the common noun form is changed to the proper noun form 『Tony』 to comply with English name writing standards.

error_sentence: That it's rabbit.
correct_sentence: That is a rabbit.
error: it's
correction: is a
error_type: Word Redundancy Error
error_severity: 4
error_description: ① Word Redundancy Error: According to English sentence structure analysis, 〈That it's〉 has a repeated subject pronoun issue; the redundant pronoun 〈it〉 should be deleted and the contraction 〈it's〉 expanded to 『That is』 to form a grammatically correct complete declarative sentence structure; ② Determiner Error: According to English grammar rules, the singular countable noun 〈rabbit〉 requires an indefinite article when first mentioned, thus it is changed to 『a rabbit』 to comply with the article usage convention for singular countable nouns.

error_sentence: It is little and thin my friend home have a rabbit.
correct_sentence: It is little and thin. My friend has a rabbit at home.
error: my friend home have
correction: . My friend has
error_type: Word Redundancy Error
error_severity: 5
error_description: ① Punctuation Error: According to the principle of English sentence completeness, the original sentence 〈It is little and thin my friend home have〉 has a structural confusion issue; a period should be used after the descriptive content to break the sentence, changing the subsequent part into an independent sentence, thus modified to 『It is little and thin. My friend has』 to achieve semantic layering; ② Word Redundancy Error: Based on semantic analysis, 〈home〉 in 〈my friend home have〉 is redundant information (neither an adverbial of place nor a necessary component) and should be deleted for conciseness; ③ Subject-Verb Agreement Error: According to English third-person singular grammar rules, the subject 〈friend〉 is singular, requiring the verb 〈have〉 to be changed to 『has』, forming the correct subject-verb structure 『My friend has』.

error_sentence: It is little and thin my friend home have a rabbit.
correct_sentence: My friend has a rabbit at home.
correction: at home
error_type: Word Order Error
error_severity: 4
error_description: ① Word Order Error: According to standard English word order (SVO + adverbial of place) conventions, the original phrase 〈my friend home have a rabbit〉 has a word order issue; the adverbial of place should be positioned at the end. Therefore, the structure is adjusted to 『My friend has a rabbit at home』, conforming to the standard sentence pattern of 'Subject + Verb + Object + Adverbial of Place'; ② Preposition Error: According to English fixed collocation rules, 〈home〉 used as an adverbial of place must be used with the preposition 〈at〉. The original phrase 〈My friend has a rabbit〉 lacks the necessary prepositional structure, leading to semantic ambiguity; 『at home』 needs to be added to fully express the meaning of 'having a rabbit at home', finally modified to 『My friend has a rabbit at home』.

error_sentence: It eat grass.
correct_sentence: It eats grass.
error: eat
correction: eats
error_type: Subject-Verb Agreement Error
error_severity: 3
error_description: Subject-Verb Agreement Error: According to the English third-person singular subject-verb agreement principle, the subject 〈It〉 is singular, requiring the verb to be in the third-person singular form, thus the base verb 〈eat〉 is changed to 『eats』, forming the correct combination 『It eats』 to comply with the third-person singular verb form.

error_sentence: But l don't like rabbit.
correct_sentence: But I don't like rabbits.
error: l
correction: I
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to English writing conventions and the meaning of the original sentence, the uppercase 'I' 『I』 was written as the lowercase 'l' 〈l〉, causing a spelling error, therefore 〈l〉 should be changed to 『I』 to conform to the original sentence meaning and correct writing standards.

error_sentence: But l don't like rabbit.
correct_sentence: But I don't like rabbits.
error: rabbit
correction: rabbits
error_type: Noun Number Error
error_severity: 3
error_description: Noun Number Error: According to the English grammar rule for generic reference in negative sentences, when referring generically to a class of things in a negative sentence, the countable noun should be in plural form. Therefore, the singular noun 〈rabbit〉 is changed to the plural form 『rabbits』; the correct form should be 『I don't like rabbits』 to comply with the grammatical standard for negative generic reference.