How to correct or make surface form the finish drawing if it is imposible to redraw

I’ve just learn to use SketchUp Pro 8 last week and try to draw my project. But I can’t. I have problem of creating surface from the drawing I make, I can not redo it, What should I do then. I need to use push&pull to make some part of my gable. thank

Make sure that:

  • your geometry is not to small
  • all lines are in the same plane

You can upload the model for more specific suggestions…