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 couldn't visualise you couldn't visualise he couldn't visualise we couldn't visualise you couldn't visualise they couldn't visualise
V-ing form
I couldn't be visualising you couldn't be visualising he couldn't be visualising we couldn't be visualising you couldn't be visualising they couldn't be visualising
Perfect
I couldn't have visualised you couldn't have visualised he couldn't have visualised we couldn't have visualised you couldn't have visualised they couldn't have visualised
V-ing perfect
I couldn't have been visualising you couldn't have been visualising he couldn't have been visualising we couldn't have been visualising you couldn't have been visualising they couldn't 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
couldn't I visualise? couldn't you visualise? couldn't he visualise? couldn't we visualise? couldn't you visualise? couldn't they visualise?
V-ing form
couldn't I be visualising? couldn't you be visualising? couldn't he be visualising? couldn't we be visualising? couldn't you be visualising? couldn't they be visualising?
Perfect
couldn't I have visualised? couldn't you have visualised? couldn't he have visualised? couldn't we have visualised? couldn't you have visualised? couldn't they have visualised?
V-ing perfect
couldn't I have been visualising? couldn't you have been visualising? couldn't he have been visualising? couldn't we have been visualising? couldn't you have been visualising? couldn't they have been visualising?