I could vivify you could vivify he could vivify we could vivify you could vivify they could vivify
V-ing form
I could be vivifying you could be vivifying he could be vivifying we could be vivifying you could be vivifying they could be vivifying
Perfect
I could have vivified you could have vivified he 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 he could have been vivifying we could have been vivifying you could have been vivifying they could have been vivifying
Negation
Simple form
I could not vivify you could not vivify he could not vivify we could not vivify you could not vivify they could not vivify
V-ing form
I could not be vivifying you could not be vivifying he could not be vivifying we could not be vivifying you could not be vivifying they could not be vivifying
Perfect
I could not have vivified you could not have vivified he could not have vivified we could not have vivified you could not have vivified they could not have vivified
V-ing perfect
I could not have been vivifying you could not have been vivifying he could not have been vivifying we could not have been vivifying you could not have been vivifying they could not have been vivifying
Interrogative form
Simple form
could I vivify? could you vivify? could he vivify? could we vivify? could you vivify? could they vivify?
V-ing form
could I be vivifying? could you be vivifying? could he be vivifying? could we be vivifying? could you be vivifying? could they be vivifying?
Perfect
could I have vivified? could you have vivified? could he 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 he have been vivifying? could we have been vivifying? could you have been vivifying? could they have been vivifying?
Interro-negative form
Simple form
could I not vivify? could you not vivify? could he not vivify? could we not vivify? could you not vivify? could they not vivify?
V-ing form
could I not be vivifying? could you not be vivifying? could he not be vivifying? could we not be vivifying? could you not be vivifying? could they not be vivifying?
Perfect
could I not have vivified? could you not have vivified? could he not have vivified? could we not have vivified? could you not have vivified? could they not have vivified?
V-ing perfect
could I not have been vivifying? could you not have been vivifying? could he not have been vivifying? could we not have been vivifying? could you not have been vivifying? could they not have been vivifying?