I could omen you could omen she could omen we could omen you could omen they could omen
V-ing form
I could be omening you could be omening she could be omening we could be omening you could be omening they could be omening
Perfect
I could have omened you could have omened she could have omened we could have omened you could have omened they could have omened
V-ing perfect
I could have been omening you could have been omening she could have been omening we could have been omening you could have been omening they could have been omening
Negation
Simple form
I couldn't omen you couldn't omen she couldn't omen we couldn't omen you couldn't omen they couldn't omen
V-ing form
I couldn't be omening you couldn't be omening she couldn't be omening we couldn't be omening you couldn't be omening they couldn't be omening
Perfect
I couldn't have omened you couldn't have omened she couldn't have omened we couldn't have omened you couldn't have omened they couldn't have omened
V-ing perfect
I couldn't have been omening you couldn't have been omening she couldn't have been omening we couldn't have been omening you couldn't have been omening they couldn't have been omening
Interrogative form
Simple form
could I omen? could you omen? could she omen? could we omen? could you omen? could they omen?
V-ing form
could I be omening? could you be omening? could she be omening? could we be omening? could you be omening? could they be omening?
Perfect
could I have omened? could you have omened? could she have omened? could we have omened? could you have omened? could they have omened?
V-ing perfect
could I have been omening? could you have been omening? could she have been omening? could we have been omening? could you have been omening? could they have been omening?
Interro-negative form
Simple form
couldn't I omen? couldn't you omen? couldn't she omen? couldn't we omen? couldn't you omen? couldn't they omen?
V-ing form
couldn't I be omening? couldn't you be omening? couldn't she be omening? couldn't we be omening? couldn't you be omening? couldn't they be omening?
Perfect
couldn't I have omened? couldn't you have omened? couldn't she have omened? couldn't we have omened? couldn't you have omened? couldn't they have omened?
V-ing perfect
couldn't I have been omening? couldn't you have been omening? couldn't she have been omening? couldn't we have been omening? couldn't you have been omening? couldn't they have been omening?