I could withdraw you could withdraw she could withdraw we could withdraw you could withdraw they could withdraw
V-ing form
I could be withdrawing you could be withdrawing she could be withdrawing we could be withdrawing you could be withdrawing they could be withdrawing
Perfect
I could have withdrawn you could have withdrawn she could have withdrawn we could have withdrawn you could have withdrawn they could have withdrawn
V-ing perfect
I could have been withdrawing you could have been withdrawing she could have been withdrawing we could have been withdrawing you could have been withdrawing they could have been withdrawing
Negation
Simple form
I could not withdraw you could not withdraw she could not withdraw we could not withdraw you could not withdraw they could not withdraw
V-ing form
I could not be withdrawing you could not be withdrawing she could not be withdrawing we could not be withdrawing you could not be withdrawing they could not be withdrawing
Perfect
I could not have withdrawn you could not have withdrawn she could not have withdrawn we could not have withdrawn you could not have withdrawn they could not have withdrawn
V-ing perfect
I could not have been withdrawing you could not have been withdrawing she could not have been withdrawing we could not have been withdrawing you could not have been withdrawing they could not have been withdrawing
Interrogative form
Simple form
could I withdraw? could you withdraw? could she withdraw? could we withdraw? could you withdraw? could they withdraw?
V-ing form
could I be withdrawing? could you be withdrawing? could she be withdrawing? could we be withdrawing? could you be withdrawing? could they be withdrawing?
Perfect
could I have withdrawn? could you have withdrawn? could she have withdrawn? could we have withdrawn? could you have withdrawn? could they have withdrawn?
V-ing perfect
could I have been withdrawing? could you have been withdrawing? could she have been withdrawing? could we have been withdrawing? could you have been withdrawing? could they have been withdrawing?
Interro-negative form
Simple form
could I not withdraw? could you not withdraw? could she not withdraw? could we not withdraw? could you not withdraw? could they not withdraw?
V-ing form
could I not be withdrawing? could you not be withdrawing? could she not be withdrawing? could we not be withdrawing? could you not be withdrawing? could they not be withdrawing?
Perfect
could I not have withdrawn? could you not have withdrawn? could she not have withdrawn? could we not have withdrawn? could you not have withdrawn? could they not have withdrawn?
V-ing perfect
could I not have been withdrawing? could you not have been withdrawing? could she not have been withdrawing? could we not have been withdrawing? could you not have been withdrawing? could they not have been withdrawing?