You are quite right in expressing your concern about plagiarism simply because very often non-native researchers lack the optimal level of stylistic skills for writing papers and they use a copy/paste approach to manage the task. However, after copying and pasting stage, the researcher should use his/her innovative skills to carefully paraphrase the content , and here , the use of tips provided by www. academic phrase bank.com can be really helpful. Finally, expose your written work (final draft) to the most robust plagiarism detection software like plagscan and try to remove other traces of plagiarism, if any.