I could liven you could liven she could liven we could liven you could liven they could liven
V-ing form
I could be livening you could be livening she could be livening we could be livening you could be livening they could be livening
Perfect
I could have livened you could have livened she 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 she 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 she 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 she 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 she 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 she 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 she liven? could we liven? could you liven? could they liven?
V-ing form
could I be livening? could you be livening? could she be livening? could we be livening? could you be livening? could they be livening?
Perfect
could I have livened? could you have livened? could she 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 she 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 she 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 she 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 she 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 she have been livening? couldn't we have been livening? couldn't you have been livening? couldn't they have been livening?