Question after import DWG from Autocad

Hi, I am pretty beginner for rhino.

I imported the lines from autocad and I recognize some curves were working normally as left image when I created surfaces, however, the right one is not working properly.

Could you help me to solve this issue? to make right curve to create proper surface.

Thank you.

Can you attach the file please. Also you should check your settings for “absolute tolerance” in file settings and “scale” when importing

And you can try to make a PlanarSrf then trim. Or patch. Is the curve planar?