I could double-talk you could double-talk he could double-talk we could double-talk you could double-talk they could double-talk
V-ing form
I could be double-talking you could be double-talking he could be double-talking we could be double-talking you could be double-talking they could be double-talking
Perfect
I could have double-talked you could have double-talked he could have double-talked we could have double-talked you could have double-talked they could have double-talked
V-ing perfect
I could have been double-talking you could have been double-talking he could have been double-talking we could have been double-talking you could have been double-talking they could have been double-talking
Negation
Simple form
I could not double-talk you could not double-talk he could not double-talk we could not double-talk you could not double-talk they could not double-talk
V-ing form
I could not be double-talking you could not be double-talking he could not be double-talking we could not be double-talking you could not be double-talking they could not be double-talking
Perfect
I could not have double-talked you could not have double-talked he could not have double-talked we could not have double-talked you could not have double-talked they could not have double-talked
V-ing perfect
I could not have been double-talking you could not have been double-talking he could not have been double-talking we could not have been double-talking you could not have been double-talking they could not have been double-talking
Interrogative form
Simple form
could I double-talk? could you double-talk? could he double-talk? could we double-talk? could you double-talk? could they double-talk?
V-ing form
could I be double-talking? could you be double-talking? could he be double-talking? could we be double-talking? could you be double-talking? could they be double-talking?
Perfect
could I have double-talked? could you have double-talked? could he have double-talked? could we have double-talked? could you have double-talked? could they have double-talked?
V-ing perfect
could I have been double-talking? could you have been double-talking? could he have been double-talking? could we have been double-talking? could you have been double-talking? could they have been double-talking?
Interro-negative form
Simple form
could I not double-talk? could you not double-talk? could he not double-talk? could we not double-talk? could you not double-talk? could they not double-talk?
V-ing form
could I not be double-talking? could you not be double-talking? could he not be double-talking? could we not be double-talking? could you not be double-talking? could they not be double-talking?
Perfect
could I not have double-talked? could you not have double-talked? could he not have double-talked? could we not have double-talked? could you not have double-talked? could they not have double-talked?
V-ing perfect
could I not have been double-talking? could you not have been double-talking? could he not have been double-talking? could we not have been double-talking? could you not have been double-talking? could they not have been double-talking?