I could visualise you could visualise he could visualise we could visualise you could visualise they could visualise
V-ing form
I could be visualising you could be visualising he could be visualising we could be visualising you could be visualising they could be visualising
Perfect
I could have visualised you could have visualised he could have visualised we could have visualised you could have visualised they could have visualised
V-ing perfect
I could have been visualising you could have been visualising he could have been visualising we could have been visualising you could have been visualising they could have been visualising
Negation
Simple form
I could not visualise you could not visualise he could not visualise we could not visualise you could not visualise they could not visualise
V-ing form
I could not be visualising you could not be visualising he could not be visualising we could not be visualising you could not be visualising they could not be visualising
Perfect
I could not have visualised you could not have visualised he could not have visualised we could not have visualised you could not have visualised they could not have visualised
V-ing perfect
I could not have been visualising you could not have been visualising he could not have been visualising we could not have been visualising you could not have been visualising they could not have been visualising
Interrogative form
Simple form
could I visualise? could you visualise? could he visualise? could we visualise? could you visualise? could they visualise?
V-ing form
could I be visualising? could you be visualising? could he be visualising? could we be visualising? could you be visualising? could they be visualising?
Perfect
could I have visualised? could you have visualised? could he have visualised? could we have visualised? could you have visualised? could they have visualised?
V-ing perfect
could I have been visualising? could you have been visualising? could he have been visualising? could we have been visualising? could you have been visualising? could they have been visualising?
Interro-negative form
Simple form
could I not visualise? could you not visualise? could he not visualise? could we not visualise? could you not visualise? could they not visualise?
V-ing form
could I not be visualising? could you not be visualising? could he not be visualising? could we not be visualising? could you not be visualising? could they not be visualising?
Perfect
could I not have visualised? could you not have visualised? could he not have visualised? could we not have visualised? could you not have visualised? could they not have visualised?
V-ing perfect
could I not have been visualising? could you not have been visualising? could he not have been visualising? could we not have been visualising? could you not have been visualising? could they not have been visualising?