But in My Country ...
If you are not from the United States, American attitudes about plagiarism may be new to you.
In some cultures, to use the words of others is a sign of honor and respect. In your country, the ownership of words may not be as important as it is in the U.S., where high value is given to using your own words. As a result, some actions that are considered "plagiarism" in the U.S. may be acceptable in your country.
Even though your instructors here may understand and respect your culture, they will judge your work by American standards. They will not tolerate plagiarism. Serious actions may be taken if you plagiarize.