I could envisage you could envisage he could envisage we could envisage you could envisage they could envisage
V-ing form
I could be envisaging you could be envisaging he could be envisaging we could be envisaging you could be envisaging they could be envisaging
Perfect
I could have envisaged you could have envisaged he could have envisaged we could have envisaged you could have envisaged they could have envisaged
V-ing perfect
I could have been envisaging you could have been envisaging he could have been envisaging we could have been envisaging you could have been envisaging they could have been envisaging
Negation
Simple form
I could not envisage you could not envisage he could not envisage we could not envisage you could not envisage they could not envisage
V-ing form
I could not be envisaging you could not be envisaging he could not be envisaging we could not be envisaging you could not be envisaging they could not be envisaging
Perfect
I could not have envisaged you could not have envisaged he could not have envisaged we could not have envisaged you could not have envisaged they could not have envisaged
V-ing perfect
I could not have been envisaging you could not have been envisaging he could not have been envisaging we could not have been envisaging you could not have been envisaging they could not have been envisaging
Interrogative form
Simple form
could I envisage? could you envisage? could he envisage? could we envisage? could you envisage? could they envisage?
V-ing form
could I be envisaging? could you be envisaging? could he be envisaging? could we be envisaging? could you be envisaging? could they be envisaging?
Perfect
could I have envisaged? could you have envisaged? could he have envisaged? could we have envisaged? could you have envisaged? could they have envisaged?
V-ing perfect
could I have been envisaging? could you have been envisaging? could he have been envisaging? could we have been envisaging? could you have been envisaging? could they have been envisaging?
Interro-negative form
Simple form
could I not envisage? could you not envisage? could he not envisage? could we not envisage? could you not envisage? could they not envisage?
V-ing form
could I not be envisaging? could you not be envisaging? could he not be envisaging? could we not be envisaging? could you not be envisaging? could they not be envisaging?
Perfect
could I not have envisaged? could you not have envisaged? could he not have envisaged? could we not have envisaged? could you not have envisaged? could they not have envisaged?
V-ing perfect
could I not have been envisaging? could you not have been envisaging? could he not have been envisaging? could we not have been envisaging? could you not have been envisaging? could they not have been envisaging?