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