English verb conjugation
COULD SUBSIST

Regular verb: subsist - subsisted - subsisted

Affirmation

Simple form	V-ing form
I could subsist you could subsist he could subsist we could subsist you could subsist they could subsist	I could be subsisting you could be subsisting he could be subsisting we could be subsisting you could be subsisting they could be subsisting
Perfect	V-ing perfect
I could have subsisted you could have subsisted he could have subsisted we could have subsisted you could have subsisted they could have subsisted	I could have been subsisting you could have been subsisting he could have been subsisting we could have been subsisting you could have been subsisting they could have been subsisting

Negation

Simple form	V-ing form
I couldn't subsist you couldn't subsist he couldn't subsist we couldn't subsist you couldn't subsist they couldn't subsist	I couldn't be subsisting you couldn't be subsisting he couldn't be subsisting we couldn't be subsisting you couldn't be subsisting they couldn't be subsisting
Perfect	V-ing perfect
I couldn't have subsisted you couldn't have subsisted he couldn't have subsisted we couldn't have subsisted you couldn't have subsisted they couldn't have subsisted	I couldn't have been subsisting you couldn't have been subsisting he couldn't have been subsisting we couldn't have been subsisting you couldn't have been subsisting they couldn't have been subsisting

Interrogative form

Simple form	V-ing form
could I subsist? could you subsist? could he subsist? could we subsist? could you subsist? could they subsist?	could I be subsisting? could you be subsisting? could he be subsisting? could we be subsisting? could you be subsisting? could they be subsisting?
Perfect	V-ing perfect
could I have subsisted? could you have subsisted? could he have subsisted? could we have subsisted? could you have subsisted? could they have subsisted?	could I have been subsisting? could you have been subsisting? could he have been subsisting? could we have been subsisting? could you have been subsisting? could they have been subsisting?

Interro-negative form

Simple form	V-ing form
couldn't I subsist? couldn't you subsist? couldn't he subsist? couldn't we subsist? couldn't you subsist? couldn't they subsist?	couldn't I be subsisting? couldn't you be subsisting? couldn't he be subsisting? couldn't we be subsisting? couldn't you be subsisting? couldn't they be subsisting?
Perfect	V-ing perfect
couldn't I have subsisted? couldn't you have subsisted? couldn't he have subsisted? couldn't we have subsisted? couldn't you have subsisted? couldn't they have subsisted?	couldn't I have been subsisting? couldn't you have been subsisting? couldn't he have been subsisting? couldn't we have been subsisting? couldn't you have been subsisting? couldn't they have been subsisting?