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 couldn't perish you couldn't perish he couldn't perish we couldn't perish you couldn't perish they couldn't perish	I couldn't be perishing you couldn't be perishing he couldn't be perishing we couldn't be perishing you couldn't be perishing they couldn't be perishing
Perfect	V-ing perfect
I couldn't have perished you couldn't have perished he couldn't have perished we couldn't have perished you couldn't have perished they couldn't have perished	I couldn't have been perishing you couldn't have been perishing he couldn't have been perishing we couldn't have been perishing you couldn't have been perishing they couldn't 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
couldn't I perish? couldn't you perish? couldn't he perish? couldn't we perish? couldn't you perish? couldn't they perish?	couldn't I be perishing? couldn't you be perishing? couldn't he be perishing? couldn't we be perishing? couldn't you be perishing? couldn't they be perishing?
Perfect	V-ing perfect
couldn't I have perished? couldn't you have perished? couldn't he have perished? couldn't we have perished? couldn't you have perished? couldn't they have perished?	couldn't I have been perishing? couldn't you have been perishing? couldn't he have been perishing? couldn't we have been perishing? couldn't you have been perishing? couldn't they have been perishing?