If the internet is not regulate, many problem can happen. People can spread fake news very fast and other people will believe it. Also, there is many harmful contents like violence and hate speech. Children is not safe because they can see bad things or talk to dangerous people. Some people also steal personal informations and use it for bad purpose. Without rules, internet can become very dangerous place.

   Student's sentence        Corrected sentence        Grammar explanation       Better sentence    

Student’s Sentence: If the internet is not regulate, many problem can happen.
Corrected Sentence: If the internet is not regulated, many problems can happen.
Grammar Explanation: Use past participle “regulated” in passive voice; “problem” should be plural.
Better Sentence: If the internet is not regulated, many serious problems can occur.

Student’s Sentence: Also, there is many harmful contents like violence and hate speech.
Corrected Sentence: Also, there are many harmful contents like violence and hate speech.
Grammar Explanation: Use “there are” for plural nouns.
Better Sentence: There are also many types of harmful content, such as violence and hate speech.

Student’s Sentence: Children is not safe because they can see bad things or talk to dangerous people.
Corrected Sentence: Children are not safe because they can see bad things or talk to dangerous people.
Grammar Explanation: “Children” is plural, so use “are.”
Better Sentence: Children are not safe because they may be exposed to harmful content or interact with dangerous people.

Student’s Sentence: Some people also steal personal informations and use it for bad purpose.
Corrected Sentence: Some people also steal personal information and use it for bad purposes.
Grammar Explanation: “Information” is uncountable; “purpose” should be plural.
Better Sentence: Some people also steal personal information and use it for harmful purposes.

Student’s Sentence: Without rules, internet can become very dangerous place.
Corrected Sentence: Without rules, the internet can become a very dangerous place.
Grammar Explanation: Add article “the” and “a” for correct noun usage.
Better Sentence: Without proper rules, the internet can become a very dangerous place.

Better Paragraph:
If the internet is not regulated, many serious problems can occur. People can spread fake news very quickly, and others may believe it. There are also many types of harmful content, such as violence and hate speech. Children are not safe because they may be exposed to harmful content or interact with dangerous people. Some individuals may also steal personal information and use it for harmful purposes. Without proper rules,