English verb conjugation
COULD KILL

Regular verb: kill - killed - killed

Affirmation

Simple form	V-ing form
I could kill you could kill she could kill we could kill you could kill they could kill	I could be killing you could be killing she could be killing we could be killing you could be killing they could be killing
Perfect	V-ing perfect
I could have killed you could have killed she could have killed we could have killed you could have killed they could have killed	I could have been killing you could have been killing she could have been killing we could have been killing you could have been killing they could have been killing

Negation

Simple form	V-ing form
I could not kill you could not kill she could not kill we could not kill you could not kill they could not kill	I could not be killing you could not be killing she could not be killing we could not be killing you could not be killing they could not be killing
Perfect	V-ing perfect
I could not have killed you could not have killed she could not have killed we could not have killed you could not have killed they could not have killed	I could not have been killing you could not have been killing she could not have been killing we could not have been killing you could not have been killing they could not have been killing

Interrogative form

Simple form	V-ing form
could I kill? could you kill? could she kill? could we kill? could you kill? could they kill?	could I be killing? could you be killing? could she be killing? could we be killing? could you be killing? could they be killing?
Perfect	V-ing perfect
could I have killed? could you have killed? could she have killed? could we have killed? could you have killed? could they have killed?	could I have been killing? could you have been killing? could she have been killing? could we have been killing? could you have been killing? could they have been killing?

Interro-negative form

Simple form	V-ing form
could I not kill? could you not kill? could she not kill? could we not kill? could you not kill? could they not kill?	could I not be killing? could you not be killing? could she not be killing? could we not be killing? could you not be killing? could they not be killing?
Perfect	V-ing perfect
could I not have killed? could you not have killed? could she not have killed? could we not have killed? could you not have killed? could they not have killed?	could I not have been killing? could you not have been killing? could she not have been killing? could we not have been killing? could you not have been killing? could they not have been killing?