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