I could prestimulate you could prestimulate he could prestimulate we could prestimulate you could prestimulate they could prestimulate
V-ing form
I could be prestimulating you could be prestimulating he could be prestimulating we could be prestimulating you could be prestimulating they could be prestimulating
Perfect
I could have prestimulated you could have prestimulated he could have prestimulated we could have prestimulated you could have prestimulated they could have prestimulated
V-ing perfect
I could have been prestimulating you could have been prestimulating he could have been prestimulating we could have been prestimulating you could have been prestimulating they could have been prestimulating
Negation
Simple form
I could not prestimulate you could not prestimulate he could not prestimulate we could not prestimulate you could not prestimulate they could not prestimulate
V-ing form
I could not be prestimulating you could not be prestimulating he could not be prestimulating we could not be prestimulating you could not be prestimulating they could not be prestimulating
Perfect
I could not have prestimulated you could not have prestimulated he could not have prestimulated we could not have prestimulated you could not have prestimulated they could not have prestimulated
V-ing perfect
I could not have been prestimulating you could not have been prestimulating he could not have been prestimulating we could not have been prestimulating you could not have been prestimulating they could not have been prestimulating
Interrogative form
Simple form
could I prestimulate? could you prestimulate? could he prestimulate? could we prestimulate? could you prestimulate? could they prestimulate?
V-ing form
could I be prestimulating? could you be prestimulating? could he be prestimulating? could we be prestimulating? could you be prestimulating? could they be prestimulating?
Perfect
could I have prestimulated? could you have prestimulated? could he have prestimulated? could we have prestimulated? could you have prestimulated? could they have prestimulated?
V-ing perfect
could I have been prestimulating? could you have been prestimulating? could he have been prestimulating? could we have been prestimulating? could you have been prestimulating? could they have been prestimulating?
Interro-negative form
Simple form
could I not prestimulate? could you not prestimulate? could he not prestimulate? could we not prestimulate? could you not prestimulate? could they not prestimulate?
V-ing form
could I not be prestimulating? could you not be prestimulating? could he not be prestimulating? could we not be prestimulating? could you not be prestimulating? could they not be prestimulating?
Perfect
could I not have prestimulated? could you not have prestimulated? could he not have prestimulated? could we not have prestimulated? could you not have prestimulated? could they not have prestimulated?
V-ing perfect
could I not have been prestimulating? could you not have been prestimulating? could he not have been prestimulating? could we not have been prestimulating? could you not have been prestimulating? could they not have been prestimulating?