Thank you for your answer, but what I mean is that I use other people's questionnaires to distribute within the scope I need to investigate, that is, can I send them directly with other people's questionnaires and mark them at last? This is ok, as long as you make a few changes, there will be no problem. Of course, this is impossible. The master's thesis will be publicized for 2 months before the defense. If you use other people's information, others will sue you for your own careful investigation. It is also possible to correct the data yourself. Just investigate a few.