I could hazard you could hazard he could hazard we could hazard you could hazard they could hazard
V-ing form
I could be hazarding you could be hazarding he could be hazarding we could be hazarding you could be hazarding they could be hazarding
Perfect
I could have hazarded you could have hazarded he could have hazarded we could have hazarded you could have hazarded they could have hazarded
V-ing perfect
I could have been hazarding you could have been hazarding he could have been hazarding we could have been hazarding you could have been hazarding they could have been hazarding
Negation
Simple form
I couldn't hazard you couldn't hazard he couldn't hazard we couldn't hazard you couldn't hazard they couldn't hazard
V-ing form
I couldn't be hazarding you couldn't be hazarding he couldn't be hazarding we couldn't be hazarding you couldn't be hazarding they couldn't be hazarding
Perfect
I couldn't have hazarded you couldn't have hazarded he couldn't have hazarded we couldn't have hazarded you couldn't have hazarded they couldn't have hazarded
V-ing perfect
I couldn't have been hazarding you couldn't have been hazarding he couldn't have been hazarding we couldn't have been hazarding you couldn't have been hazarding they couldn't have been hazarding
Interrogative form
Simple form
could I hazard? could you hazard? could he hazard? could we hazard? could you hazard? could they hazard?
V-ing form
could I be hazarding? could you be hazarding? could he be hazarding? could we be hazarding? could you be hazarding? could they be hazarding?
Perfect
could I have hazarded? could you have hazarded? could he have hazarded? could we have hazarded? could you have hazarded? could they have hazarded?
V-ing perfect
could I have been hazarding? could you have been hazarding? could he have been hazarding? could we have been hazarding? could you have been hazarding? could they have been hazarding?
Interro-negative form
Simple form
couldn't I hazard? couldn't you hazard? couldn't he hazard? couldn't we hazard? couldn't you hazard? couldn't they hazard?
V-ing form
couldn't I be hazarding? couldn't you be hazarding? couldn't he be hazarding? couldn't we be hazarding? couldn't you be hazarding? couldn't they be hazarding?
Perfect
couldn't I have hazarded? couldn't you have hazarded? couldn't he have hazarded? couldn't we have hazarded? couldn't you have hazarded? couldn't they have hazarded?
V-ing perfect
couldn't I have been hazarding? couldn't you have been hazarding? couldn't he have been hazarding? couldn't we have been hazarding? couldn't you have been hazarding? couldn't they have been hazarding?