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