I could bechance you could bechance he could bechance we could bechance you could bechance they could bechance
V-ing form
I could be bechancing you could be bechancing he could be bechancing we could be bechancing you could be bechancing they could be bechancing
Perfect
I could have bechanced you could have bechanced he 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 he 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 he 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 he 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 he 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 he 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 he bechance? could we bechance? could you bechance? could they bechance?
V-ing form
could I be bechancing? could you be bechancing? could he be bechancing? could we be bechancing? could you be bechancing? could they be bechancing?
Perfect
could I have bechanced? could you have bechanced? could he 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 he 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 he 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 he 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 he 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 he not have been bechancing? could we not have been bechancing? could you not have been bechancing? could they not have been bechancing?