It depends on how you think. if you ask your English teacher she may tell that you walk on foot in proper English and if you ask your geo teacher she may tell you that we walk on earth.thus depends on how you think ...
hey I was just joking about. don't ask your teacher okay.did u?
no nooo
but plss dont joke i want the ansss
no I'm not joking. I am serious in the sentence that is it depends on how you think.