Large field inflation models are favored by the recent BICEP2 that has detected gravitational wave modes generated during inflation .
We study general large field inflation models for which the potential contains ( constant ) quadratic and quartic terms of inflaton field .
We show , in this framework , those inflation models can generate the fluctuation with the tensor-to-scalar ratio of 0.2 as well as the scalar spectral index of 0.96 : those are very close to the center value of the tensor-to-scalar ratio reported by BICEP2 as well as Planck .
Finally , we briefly discuss the particle physics model building of inflation .