English verb conjugation
COULD PERISH

Regular verb: perish - perished - perished

Affirmation

Simple form	V-ing form
I could perish you could perish he could perish we could perish you could perish they could perish	I could be perishing you could be perishing he could be perishing we could be perishing you could be perishing they could be perishing
Perfect	V-ing perfect
I could have perished you could have perished he could have perished we could have perished you could have perished they could have perished	I could have been perishing you could have been perishing he could have been perishing we could have been perishing you could have been perishing they could have been perishing

Negation

Simple form	V-ing form
I could not perish you could not perish he could not perish we could not perish you could not perish they could not perish	I could not be perishing you could not be perishing he could not be perishing we could not be perishing you could not be perishing they could not be perishing
Perfect	V-ing perfect
I could not have perished you could not have perished he could not have perished we could not have perished you could not have perished they could not have perished	I could not have been perishing you could not have been perishing he could not have been perishing we could not have been perishing you could not have been perishing they could not have been perishing

Interrogative form

Simple form	V-ing form
could I perish? could you perish? could he perish? could we perish? could you perish? could they perish?	could I be perishing? could you be perishing? could he be perishing? could we be perishing? could you be perishing? could they be perishing?
Perfect	V-ing perfect
could I have perished? could you have perished? could he have perished? could we have perished? could you have perished? could they have perished?	could I have been perishing? could you have been perishing? could he have been perishing? could we have been perishing? could you have been perishing? could they have been perishing?

Interro-negative form

Simple form	V-ing form
could I not perish? could you not perish? could he not perish? could we not perish? could you not perish? could they not perish?	could I not be perishing? could you not be perishing? could he not be perishing? could we not be perishing? could you not be perishing? could they not be perishing?
Perfect	V-ing perfect
could I not have perished? could you not have perished? could he not have perished? could we not have perished? could you not have perished? could they not have perished?	could I not have been perishing? could you not have been perishing? could he not have been perishing? could we not have been perishing? could you not have been perishing? could they not have been perishing?