Writing prompt: Make Use of iPad

Student essay:
Dear Editor,
I'm a senior high school student named Li Hua.
Nowadays, iPad has become an absolutely popular tool in our life and it has become a great help to almost all of us.Generally, it's advantages can be seen as follows.First of all, by using iPad, not only can we listen to music but also read text books.Besides, we can play games.
But every coin has two sides.The negative aspects are also appear.One of the disadvantages is that it will waste a lot of valuable time.And it will also influence our studies.To make matter worse, it will do harm to our eyes.
As far as I am concerned, iPad will do us students both good and harm.What matters most is how we make use of it.

Corrected essay:
Dear Editor,
I'm a senior high school student named Li Hua.
Nowadays, iPad has become an absolutely popular tool in our life and it has become a great help to almost all of us. Generally, its advantages can be seen as follows. First of all, by using iPad, not only can we listen to music but also read textbooks. Besides, we can play games.
But every coin has two sides. The negative aspects also appear. One of the disadvantages is that it will waste a lot of valuable time. And it will also influence our studies. To make the matters worse, it will do harm to our eyes.
As far as I am concerned, iPad will do us students both good and harm. What matters most is how we make use of it.

Error analysis:
error_sentence: Generally, it's advantages can be seen as follows.
correct_sentence: Generally, its advantages can be seen as follows.
error: it's
correction: its
error_type: Pronoun Error
error_severity: 2
error_description: Pronoun Error: According to the sentence meaning, it intends to express “its”; the original 〈it's〉 is incorrect, the possessive form should be 『its』, therefore 〈it's〉 is changed to 『its』 to indicate possession and fit the context.
error_sentence: First of all, by using iPad, not only can we listen to music but also read text books.
correct_sentence: First of all, by using iPad, not only can we listen to music but also read textbooks.
error: text books
correction: textbooks
error_type: Spelling Error
error_severity: 2
error_description: Spelling Error: According to the context, it intends to express “textbooks”; 〈text books〉 is a compound noun, which according to English convention should be combined into 『textbooks』 without a space, therefore 〈text books〉 needs to be changed to 『textbooks』 to fit the meaning.
error_sentence: The negative aspects are also appear.
correct_sentence: The negative aspects also appear.
error: are
error_type: Word Redundancy Error
error_severity: 4
error_description: Word Redundancy Error: According to English grammar rules, the original sentence 〈are also appear〉 has a redundant linking verb; the be-verb appearing alone means “is/exists”, so 〈are〉 should be deleted and changed to 『also appear』 to conform to English grammar.
error_sentence: To make matter worse, it will do harm to our eyes.

correct_sentence: To make the matters worse, it will do harm to our eyes.

error: matter
correction: the matters
error_type: Noun Number Error
error_severity: 4
error_description: ① Determiner Error: According to the context, the determiner 『the』 is missing before 〈matter〉 to indicate specific meaning, therefore 『the』 needs to be added to fit the context; ② Noun Number Error: According to English expression habits, 〈matter〉 should be changed to the plural form 『matters』 to indicate a general reference, to conform to idiomatic expression.