I could overcome you could overcome he could overcome we could overcome you could overcome they could overcome
V-ing form
I could be overcoming you could be overcoming he could be overcoming we could be overcoming you could be overcoming they could be overcoming
Perfect
I could have overcome you could have overcome he could have overcome we could have overcome you could have overcome they could have overcome
V-ing perfect
I could have been overcoming you could have been overcoming he could have been overcoming we could have been overcoming you could have been overcoming they could have been overcoming
Negation
Simple form
I could not overcome you could not overcome he could not overcome we could not overcome you could not overcome they could not overcome
V-ing form
I could not be overcoming you could not be overcoming he could not be overcoming we could not be overcoming you could not be overcoming they could not be overcoming
Perfect
I could not have overcome you could not have overcome he could not have overcome we could not have overcome you could not have overcome they could not have overcome
V-ing perfect
I could not have been overcoming you could not have been overcoming he could not have been overcoming we could not have been overcoming you could not have been overcoming they could not have been overcoming
Interrogative form
Simple form
could I overcome? could you overcome? could he overcome? could we overcome? could you overcome? could they overcome?
V-ing form
could I be overcoming? could you be overcoming? could he be overcoming? could we be overcoming? could you be overcoming? could they be overcoming?
Perfect
could I have overcome? could you have overcome? could he have overcome? could we have overcome? could you have overcome? could they have overcome?
V-ing perfect
could I have been overcoming? could you have been overcoming? could he have been overcoming? could we have been overcoming? could you have been overcoming? could they have been overcoming?
Interro-negative form
Simple form
could I not overcome? could you not overcome? could he not overcome? could we not overcome? could you not overcome? could they not overcome?
V-ing form
could I not be overcoming? could you not be overcoming? could he not be overcoming? could we not be overcoming? could you not be overcoming? could they not be overcoming?
Perfect
could I not have overcome? could you not have overcome? could he not have overcome? could we not have overcome? could you not have overcome? could they not have overcome?
V-ing perfect
could I not have been overcoming? could you not have been overcoming? could he not have been overcoming? could we not have been overcoming? could you not have been overcoming? could they not have been overcoming?