I could manipulate you could manipulate he could manipulate we could manipulate you could manipulate they could manipulate
V-ing form
I could be manipulating you could be manipulating he could be manipulating we could be manipulating you could be manipulating they could be manipulating
Perfect
I could have manipulated you could have manipulated he could have manipulated we could have manipulated you could have manipulated they could have manipulated
V-ing perfect
I could have been manipulating you could have been manipulating he could have been manipulating we could have been manipulating you could have been manipulating they could have been manipulating
Negation
Simple form
I could not manipulate you could not manipulate he could not manipulate we could not manipulate you could not manipulate they could not manipulate
V-ing form
I could not be manipulating you could not be manipulating he could not be manipulating we could not be manipulating you could not be manipulating they could not be manipulating
Perfect
I could not have manipulated you could not have manipulated he could not have manipulated we could not have manipulated you could not have manipulated they could not have manipulated
V-ing perfect
I could not have been manipulating you could not have been manipulating he could not have been manipulating we could not have been manipulating you could not have been manipulating they could not have been manipulating
Interrogative form
Simple form
could I manipulate? could you manipulate? could he manipulate? could we manipulate? could you manipulate? could they manipulate?
V-ing form
could I be manipulating? could you be manipulating? could he be manipulating? could we be manipulating? could you be manipulating? could they be manipulating?
Perfect
could I have manipulated? could you have manipulated? could he have manipulated? could we have manipulated? could you have manipulated? could they have manipulated?
V-ing perfect
could I have been manipulating? could you have been manipulating? could he have been manipulating? could we have been manipulating? could you have been manipulating? could they have been manipulating?
Interro-negative form
Simple form
could I not manipulate? could you not manipulate? could he not manipulate? could we not manipulate? could you not manipulate? could they not manipulate?
V-ing form
could I not be manipulating? could you not be manipulating? could he not be manipulating? could we not be manipulating? could you not be manipulating? could they not be manipulating?
Perfect
could I not have manipulated? could you not have manipulated? could he not have manipulated? could we not have manipulated? could you not have manipulated? could they not have manipulated?
V-ing perfect
could I not have been manipulating? could you not have been manipulating? could he not have been manipulating? could we not have been manipulating? could you not have been manipulating? could they not have been manipulating?