I could part you could part she could part we could part you could part they could part
V-ing form
I could be parting you could be parting she could be parting we could be parting you could be parting they could be parting
Perfect
I could have parted you could have parted she could have parted we could have parted you could have parted they could have parted
V-ing perfect
I could have been parting you could have been parting she could have been parting we could have been parting you could have been parting they could have been parting
Negation
Simple form
I could not part you could not part she could not part we could not part you could not part they could not part
V-ing form
I could not be parting you could not be parting she could not be parting we could not be parting you could not be parting they could not be parting
Perfect
I could not have parted you could not have parted she could not have parted we could not have parted you could not have parted they could not have parted
V-ing perfect
I could not have been parting you could not have been parting she could not have been parting we could not have been parting you could not have been parting they could not have been parting
Interrogative form
Simple form
could I part? could you part? could she part? could we part? could you part? could they part?
V-ing form
could I be parting? could you be parting? could she be parting? could we be parting? could you be parting? could they be parting?
Perfect
could I have parted? could you have parted? could she have parted? could we have parted? could you have parted? could they have parted?
V-ing perfect
could I have been parting? could you have been parting? could she have been parting? could we have been parting? could you have been parting? could they have been parting?
Interro-negative form
Simple form
could I not part? could you not part? could she not part? could we not part? could you not part? could they not part?
V-ing form
could I not be parting? could you not be parting? could she not be parting? could we not be parting? could you not be parting? could they not be parting?
Perfect
could I not have parted? could you not have parted? could she not have parted? could we not have parted? could you not have parted? could they not have parted?
V-ing perfect
could I not have been parting? could you not have been parting? could she not have been parting? could we not have been parting? could you not have been parting? could they not have been parting?