English verb conjugation
COULD VANISH

Regular verb: vanish - vanished - vanished

Affirmation

Simple form	V-ing form
I could vanish you could vanish he could vanish we could vanish you could vanish they could vanish	I could be vanishing you could be vanishing he could be vanishing we could be vanishing you could be vanishing they could be vanishing
Perfect	V-ing perfect
I could have vanished you could have vanished he could have vanished we could have vanished you could have vanished they could have vanished	I could have been vanishing you could have been vanishing he could have been vanishing we could have been vanishing you could have been vanishing they could have been vanishing

Negation

Simple form	V-ing form
I could not vanish you could not vanish he could not vanish we could not vanish you could not vanish they could not vanish	I could not be vanishing you could not be vanishing he could not be vanishing we could not be vanishing you could not be vanishing they could not be vanishing
Perfect	V-ing perfect
I could not have vanished you could not have vanished he could not have vanished we could not have vanished you could not have vanished they could not have vanished	I could not have been vanishing you could not have been vanishing he could not have been vanishing we could not have been vanishing you could not have been vanishing they could not have been vanishing

Interrogative form

Simple form	V-ing form
could I vanish? could you vanish? could he vanish? could we vanish? could you vanish? could they vanish?	could I be vanishing? could you be vanishing? could he be vanishing? could we be vanishing? could you be vanishing? could they be vanishing?
Perfect	V-ing perfect
could I have vanished? could you have vanished? could he have vanished? could we have vanished? could you have vanished? could they have vanished?	could I have been vanishing? could you have been vanishing? could he have been vanishing? could we have been vanishing? could you have been vanishing? could they have been vanishing?

Interro-negative form

Simple form	V-ing form
could I not vanish? could you not vanish? could he not vanish? could we not vanish? could you not vanish? could they not vanish?	could I not be vanishing? could you not be vanishing? could he not be vanishing? could we not be vanishing? could you not be vanishing? could they not be vanishing?
Perfect	V-ing perfect
could I not have vanished? could you not have vanished? could he not have vanished? could we not have vanished? could you not have vanished? could they not have vanished?	could I not have been vanishing? could you not have been vanishing? could he not have been vanishing? could we not have been vanishing? could you not have been vanishing? could they not have been vanishing?