I could mount you could mount she could mount we could mount you could mount they could mount
V-ing form
I could be mounting you could be mounting she could be mounting we could be mounting you could be mounting they could be mounting
Perfect
I could have mounted you could have mounted she could have mounted we could have mounted you could have mounted they could have mounted
V-ing perfect
I could have been mounting you could have been mounting she could have been mounting we could have been mounting you could have been mounting they could have been mounting
Negation
Simple form
I could not mount you could not mount she could not mount we could not mount you could not mount they could not mount
V-ing form
I could not be mounting you could not be mounting she could not be mounting we could not be mounting you could not be mounting they could not be mounting
Perfect
I could not have mounted you could not have mounted she could not have mounted we could not have mounted you could not have mounted they could not have mounted
V-ing perfect
I could not have been mounting you could not have been mounting she could not have been mounting we could not have been mounting you could not have been mounting they could not have been mounting
Interrogative form
Simple form
could I mount? could you mount? could she mount? could we mount? could you mount? could they mount?
V-ing form
could I be mounting? could you be mounting? could she be mounting? could we be mounting? could you be mounting? could they be mounting?
Perfect
could I have mounted? could you have mounted? could she have mounted? could we have mounted? could you have mounted? could they have mounted?
V-ing perfect
could I have been mounting? could you have been mounting? could she have been mounting? could we have been mounting? could you have been mounting? could they have been mounting?
Interro-negative form
Simple form
could I not mount? could you not mount? could she not mount? could we not mount? could you not mount? could they not mount?
V-ing form
could I not be mounting? could you not be mounting? could she not be mounting? could we not be mounting? could you not be mounting? could they not be mounting?
Perfect
could I not have mounted? could you not have mounted? could she not have mounted? could we not have mounted? could you not have mounted? could they not have mounted?
V-ing perfect
could I not have been mounting? could you not have been mounting? could she not have been mounting? could we not have been mounting? could you not have been mounting? could they not have been mounting?