I could subsist you could subsist he could subsist we could subsist you could subsist they could subsist
V-ing form
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
I could have subsisted you could have subsisted he could have subsisted we could have subsisted you could have subsisted they could have subsisted
V-ing perfect
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
I couldn't subsist you couldn't subsist he couldn't subsist we couldn't subsist you couldn't subsist they couldn't subsist
V-ing form
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
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
V-ing perfect
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
could I subsist? could you subsist? could he subsist? could we subsist? could you subsist? could they subsist?
V-ing form
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
could I have subsisted? could you have subsisted? could he have subsisted? could we have subsisted? could you have subsisted? could they have subsisted?
V-ing perfect
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
couldn't I subsist? couldn't you subsist? couldn't he subsist? couldn't we subsist? couldn't you subsist? couldn't they subsist?
V-ing form
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
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?
V-ing perfect
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?