I could twist you could twist she could twist we could twist you could twist they could twist
V-ing form
I could be twisting you could be twisting she could be twisting we could be twisting you could be twisting they could be twisting
Perfect
I could have twisted you could have twisted she could have twisted we could have twisted you could have twisted they could have twisted
V-ing perfect
I could have been twisting you could have been twisting she could have been twisting we could have been twisting you could have been twisting they could have been twisting
Negation
Simple form
I could not twist you could not twist she could not twist we could not twist you could not twist they could not twist
V-ing form
I could not be twisting you could not be twisting she could not be twisting we could not be twisting you could not be twisting they could not be twisting
Perfect
I could not have twisted you could not have twisted she could not have twisted we could not have twisted you could not have twisted they could not have twisted
V-ing perfect
I could not have been twisting you could not have been twisting she could not have been twisting we could not have been twisting you could not have been twisting they could not have been twisting
Interrogative form
Simple form
could I twist? could you twist? could she twist? could we twist? could you twist? could they twist?
V-ing form
could I be twisting? could you be twisting? could she be twisting? could we be twisting? could you be twisting? could they be twisting?
Perfect
could I have twisted? could you have twisted? could she have twisted? could we have twisted? could you have twisted? could they have twisted?
V-ing perfect
could I have been twisting? could you have been twisting? could she have been twisting? could we have been twisting? could you have been twisting? could they have been twisting?
Interro-negative form
Simple form
could I not twist? could you not twist? could she not twist? could we not twist? could you not twist? could they not twist?
V-ing form
could I not be twisting? could you not be twisting? could she not be twisting? could we not be twisting? could you not be twisting? could they not be twisting?
Perfect
could I not have twisted? could you not have twisted? could she not have twisted? could we not have twisted? could you not have twisted? could they not have twisted?
V-ing perfect
could I not have been twisting? could you not have been twisting? could she not have been twisting? could we not have been twisting? could you not have been twisting? could they not have been twisting?