Suspicious because there is no reason for them to
You'll want to leave it out. if it isn't conducive to the content of your paper, it's more like a distraction from what you're trying to say. parentheses might be a "safe" way to signify a side topic, but it weakens the paper as a general statement because the reader has to pause and take a moment to absorb a new topic before going back to what you were saying
Answer:
Just to let you know if you copy what someone has written on here onto a test or a paper that is considered plagiarism.
Because they're are some sentence or things that a real person that speak the language would say in different way