Can I use these assets in my own game?

Hi everyone,
Recently I made a game, and I used some assets from unity asset store, these assets are models and animations from the sample assets of Unity, for example, the Third Person Character(Ethan) of "Standard Assets", and the Ellen of the "3D Game Kit - Character Pack", and some other models from
My question is : Can I use these assets in my own game? I think I can, because they are free and from the Standard assets of Unity itself.