Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could warrant sth you could warrant sth he could warrant sth we could warrant sth you could warrant sth they could warrant sth
V-ing form
I could be warrant sthing you could be warrant sthing he could be warrant sthing we could be warrant sthing you could be warrant sthing they could be warrant sthing
Perfect
I could have warrant sthed you could have warrant sthed he could have warrant sthed we could have warrant sthed you could have warrant sthed they could have warrant sthed
V-ing perfect
I could have been warrant sthing you could have been warrant sthing he could have been warrant sthing we could have been warrant sthing you could have been warrant sthing they could have been warrant sthing
Negation
Simple form
I could not warrant sth you could not warrant sth he could not warrant sth we could not warrant sth you could not warrant sth they could not warrant sth
V-ing form
I could not be warrant sthing you could not be warrant sthing he could not be warrant sthing we could not be warrant sthing you could not be warrant sthing they could not be warrant sthing
Perfect
I could not have warrant sthed you could not have warrant sthed he could not have warrant sthed we could not have warrant sthed you could not have warrant sthed they could not have warrant sthed
V-ing perfect
I could not have been warrant sthing you could not have been warrant sthing he could not have been warrant sthing we could not have been warrant sthing you could not have been warrant sthing they could not have been warrant sthing
Interrogative form
Simple form
could I warrant sth? could you warrant sth? could he warrant sth? could we warrant sth? could you warrant sth? could they warrant sth?
V-ing form
could I be warrant sthing? could you be warrant sthing? could he be warrant sthing? could we be warrant sthing? could you be warrant sthing? could they be warrant sthing?
Perfect
could I have warrant sthed? could you have warrant sthed? could he have warrant sthed? could we have warrant sthed? could you have warrant sthed? could they have warrant sthed?
V-ing perfect
could I have been warrant sthing? could you have been warrant sthing? could he have been warrant sthing? could we have been warrant sthing? could you have been warrant sthing? could they have been warrant sthing?
Interro-negative form
Simple form
could I not warrant sth? could you not warrant sth? could he not warrant sth? could we not warrant sth? could you not warrant sth? could they not warrant sth?
V-ing form
could I not be warrant sthing? could you not be warrant sthing? could he not be warrant sthing? could we not be warrant sthing? could you not be warrant sthing? could they not be warrant sthing?
Perfect
could I not have warrant sthed? could you not have warrant sthed? could he not have warrant sthed? could we not have warrant sthed? could you not have warrant sthed? could they not have warrant sthed?
V-ing perfect
could I not have been warrant sthing? could you not have been warrant sthing? could he not have been warrant sthing? could we not have been warrant sthing? could you not have been warrant sthing? could they not have been warrant sthing?