Cook pasta in a large pot of boiling salted water, stirring occasionally, until al dente; drain, reserving 2 cups pasta cooking liquid.Meanwhile, heat oil in a large pot over medium-high. Add sausage, pepper flakes ,and corn, cook, just until warmed. Add tomatoes,green onions, basil, and l c pasta cooking liquid just until heated through. Serve with freshly grated parmesan and a little chopped fresh basil.