strongly      I am convinced/sure/positive that ...

      ­           I strongly believe that ...

                 I have absolutely no doubt that ...

                 I definitely/certainly think that ...

                 I really do think that ...

                    I really feel that ...

                    In my opinion/view ...

neutrally     I think/consider/feel that ...

                 I believe that...

                 As I see it, ...

                 To my mind ...

                 From my point of view ...

                   I am inclined to think that ...

weakly       I tend to think that ...