Whether text copied and pasted from an AI generates detectable patterns depends on several factors, including the context in which it's used and the tools available for detection. Some detection tools can identify AI-generated text based on specific linguistic patterns, lack of depth, or other characteristics intrinsic to machine-generated content.
If you're using the text for purposes where authenticity is important (like academic work), it's best to rewrite or paraphrase it in your own words and provide proper citations where necessary. This not only helps avoid detection but also enhances originality and personal understanding of the material.