[Korrektur] Comment: Teenagers should not have their[...]

Zitat:
The discussion about „Teenagers should not have their own computers because it is too dangerous“ has become more and more popular, since the number of teenagers, becoming victims of cybercrime, has increased.
In the following comment I am going to discuss [---] the positive and negative aspects of this topic.

First of all I think that currently a computer is very necessary for our teenagers, because it offers so many opportunities, for example to look for their homework or to chat with their friends who are far away.
But this not the only argument for computers. Furthermore you can watch high definition movies on the computer, if it has the suitable technology.
Despite of these positive aspects, we must take care of our children and also have to see the negative aspects.

I also believe that parents should pay attention to what their children do on the Internet and which sites they visit. Take for example, contact requests of persons with criminal intent or the fact that the children can lose touch with reality by too many social networks . Moreover dewy-eyed children are increasingly victims of phishing or confidence tricks on online shopping platforms .

Weighing up the pros and cons, I come to the conclusion that at the present time a computer is a necessary equipment and pro aspects are outweighing. I agree that computers are a high risk for our children, but if parents keep a watchful eye on [---] them, I think the computer will be a great supplementation.

Zitat:
Weshalb wird hier die Form von has verwendet an einigen Stellen anstatt "have"?