I could bechance you could bechance she could bechance we could bechance you could bechance they could bechance
V-ing form
I could be bechancing you could be bechancing she could be bechancing we could be bechancing you could be bechancing they could be bechancing
Perfect
I could have bechanced you could have bechanced she could have bechanced we could have bechanced you could have bechanced they could have bechanced
V-ing perfect
I could have been bechancing you could have been bechancing she could have been bechancing we could have been bechancing you could have been bechancing they could have been bechancing
Negation
Simple form
I could not bechance you could not bechance she could not bechance we could not bechance you could not bechance they could not bechance
V-ing form
I could not be bechancing you could not be bechancing she could not be bechancing we could not be bechancing you could not be bechancing they could not be bechancing
Perfect
I could not have bechanced you could not have bechanced she could not have bechanced we could not have bechanced you could not have bechanced they could not have bechanced
V-ing perfect
I could not have been bechancing you could not have been bechancing she could not have been bechancing we could not have been bechancing you could not have been bechancing they could not have been bechancing
Interrogative form
Simple form
could I bechance? could you bechance? could she bechance? could we bechance? could you bechance? could they bechance?
V-ing form
could I be bechancing? could you be bechancing? could she be bechancing? could we be bechancing? could you be bechancing? could they be bechancing?
Perfect
could I have bechanced? could you have bechanced? could she have bechanced? could we have bechanced? could you have bechanced? could they have bechanced?
V-ing perfect
could I have been bechancing? could you have been bechancing? could she have been bechancing? could we have been bechancing? could you have been bechancing? could they have been bechancing?
Interro-negative form
Simple form
could I not bechance? could you not bechance? could she not bechance? could we not bechance? could you not bechance? could they not bechance?
V-ing form
could I not be bechancing? could you not be bechancing? could she not be bechancing? could we not be bechancing? could you not be bechancing? could they not be bechancing?
Perfect
could I not have bechanced? could you not have bechanced? could she not have bechanced? could we not have bechanced? could you not have bechanced? could they not have bechanced?
V-ing perfect
could I not have been bechancing? could you not have been bechancing? could she not have been bechancing? could we not have been bechancing? could you not have been bechancing? could they not have been bechancing?