******************CORRECTIONS**********************

Student: I think body piercing is bad. because the body piercing is strange.
Correct: I think body piercing is bad because it is strange.

Explanation: You can use the pronoun "it" to replace "body piercing".
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Student: Think about this, You walk a street and there are person who has a lot of ring on her face. I think it is really horrible!
Correct: Think about this, you walk on a street and there is person who has a lot of rings on her face, I think it is really horrible!

Explanation: Use the preposition "on" to show placement of location. We use "is" because your subject (person) is singular. Then, we use "rings" because you said "lots" which expresses plural.
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Student: Also, when person who has a lot of piercing, the people will stare at her.
Correct: Also, when a person has a lot of piercings, the people will stare at her.

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Student: Because, they think that is strange, so I think The body piercing is bad. Also It's hard to take good care of pirecing.
Correct: Because they think that is strange, so I think The body piercing is bad. Also, It's hard to take good care of piercing.

Explanation: Please check your spelling, Lina.
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Student: If she doesn't take good care of her pirecing, there are sore oozes.
Correct: If she doesn't take good care of her piercing, there are sore oozes...

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Student: And It's annoying to disinfection.
Correct: ...and It's annoying to disinfection.

Explanation: disinfection is the method, disinfect is the verb
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Student:  If you has piercing, you must disinfection everyday.
Correct: If you have a piercing, you must disinfection everyday

Explanation: disinfection is the method, disinfect is the verb
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Student: If you are so tired, but you must disinfection.
Correct: If you are so tired, you still need to disinfect...

Explanation: It is better to construct your sentence this way
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Student: And If you do piercing, you can't sleep comfortable.
Correct: ...and if you do piercing, you can't sleep comfortable...

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Student: Because you can't tossed and turned.
Correct: ...because you can't tossed and turned.

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Student: Like these example, I think body piercing is bad.
Correct: These are the reasons that's why I think body piercing is bad.

***************TEACHER'S COMMENT********************

Hello, Lina!

Thank you so much for submitting your homework. Please check your corrections. Keep in mind my explanations during our class, alright?
I'll be seeing you again tomorrow and have a great day! :)

- Teacher Claire