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 couldn't manipulate you couldn't manipulate he couldn't manipulate we couldn't manipulate you couldn't manipulate they couldn't manipulate
V-ing form
I couldn't be manipulating you couldn't be manipulating he couldn't be manipulating we couldn't be manipulating you couldn't be manipulating they couldn't be manipulating
Perfect
I couldn't have manipulated you couldn't have manipulated he couldn't have manipulated we couldn't have manipulated you couldn't have manipulated they couldn't have manipulated
V-ing perfect
I couldn't have been manipulating you couldn't have been manipulating he couldn't have been manipulating we couldn't have been manipulating you couldn't have been manipulating they couldn't 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
couldn't I manipulate? couldn't you manipulate? couldn't he manipulate? couldn't we manipulate? couldn't you manipulate? couldn't they manipulate?
V-ing form
couldn't I be manipulating? couldn't you be manipulating? couldn't he be manipulating? couldn't we be manipulating? couldn't you be manipulating? couldn't they be manipulating?
Perfect
couldn't I have manipulated? couldn't you have manipulated? couldn't he have manipulated? couldn't we have manipulated? couldn't you have manipulated? couldn't they have manipulated?
V-ing perfect
couldn't I have been manipulating? couldn't you have been manipulating? couldn't he have been manipulating? couldn't we have been manipulating? couldn't you have been manipulating? couldn't they have been manipulating?