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 couldn't envisage you couldn't envisage he couldn't envisage we couldn't envisage you couldn't envisage they couldn't envisage
V-ing form
I couldn't be envisaging you couldn't be envisaging he couldn't be envisaging we couldn't be envisaging you couldn't be envisaging they couldn't be envisaging
Perfect
I couldn't have envisaged you couldn't have envisaged he couldn't have envisaged we couldn't have envisaged you couldn't have envisaged they couldn't have envisaged
V-ing perfect
I couldn't have been envisaging you couldn't have been envisaging he couldn't have been envisaging we couldn't have been envisaging you couldn't have been envisaging they couldn't 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
couldn't I envisage? couldn't you envisage? couldn't he envisage? couldn't we envisage? couldn't you envisage? couldn't they envisage?
V-ing form
couldn't I be envisaging? couldn't you be envisaging? couldn't he be envisaging? couldn't we be envisaging? couldn't you be envisaging? couldn't they be envisaging?
Perfect
couldn't I have envisaged? couldn't you have envisaged? couldn't he have envisaged? couldn't we have envisaged? couldn't you have envisaged? couldn't they have envisaged?
V-ing perfect
couldn't I have been envisaging? couldn't you have been envisaging? couldn't he have been envisaging? couldn't we have been envisaging? couldn't you have been envisaging? couldn't they have been envisaging?