I could unite you could unite she could unite we could unite you could unite they could unite
V-ing form
I could be uniting you could be uniting she could be uniting we could be uniting you could be uniting they could be uniting
Perfect
I could have united you could have united she could have united we could have united you could have united they could have united
V-ing perfect
I could have been uniting you could have been uniting she could have been uniting we could have been uniting you could have been uniting they could have been uniting
Negation
Simple form
I could not unite you could not unite she could not unite we could not unite you could not unite they could not unite
V-ing form
I could not be uniting you could not be uniting she could not be uniting we could not be uniting you could not be uniting they could not be uniting
Perfect
I could not have united you could not have united she could not have united we could not have united you could not have united they could not have united
V-ing perfect
I could not have been uniting you could not have been uniting she could not have been uniting we could not have been uniting you could not have been uniting they could not have been uniting
Interrogative form
Simple form
could I unite? could you unite? could she unite? could we unite? could you unite? could they unite?
V-ing form
could I be uniting? could you be uniting? could she be uniting? could we be uniting? could you be uniting? could they be uniting?
Perfect
could I have united? could you have united? could she have united? could we have united? could you have united? could they have united?
V-ing perfect
could I have been uniting? could you have been uniting? could she have been uniting? could we have been uniting? could you have been uniting? could they have been uniting?
Interro-negative form
Simple form
could I not unite? could you not unite? could she not unite? could we not unite? could you not unite? could they not unite?
V-ing form
could I not be uniting? could you not be uniting? could she not be uniting? could we not be uniting? could you not be uniting? could they not be uniting?
Perfect
could I not have united? could you not have united? could she not have united? could we not have united? could you not have united? could they not have united?
V-ing perfect
could I not have been uniting? could you not have been uniting? could she not have been uniting? could we not have been uniting? could you not have been uniting? could they not have been uniting?