English verb conjugation
COULD SUP

Regular verb: sup - supped - supped

Affirmation

Simple form	V-ing form
I could sup you could sup he could sup we could sup you could sup they could sup	I could be supping you could be supping he could be supping we could be supping you could be supping they could be supping
Perfect	V-ing perfect
I could have supped you could have supped he could have supped we could have supped you could have supped they could have supped	I could have been supping you could have been supping he could have been supping we could have been supping you could have been supping they could have been supping

Negation

Simple form	V-ing form
I couldn't sup you couldn't sup he couldn't sup we couldn't sup you couldn't sup they couldn't sup	I couldn't be supping you couldn't be supping he couldn't be supping we couldn't be supping you couldn't be supping they couldn't be supping
Perfect	V-ing perfect
I couldn't have supped you couldn't have supped he couldn't have supped we couldn't have supped you couldn't have supped they couldn't have supped	I couldn't have been supping you couldn't have been supping he couldn't have been supping we couldn't have been supping you couldn't have been supping they couldn't have been supping

Interrogative form

Simple form	V-ing form
could I sup? could you sup? could he sup? could we sup? could you sup? could they sup?	could I be supping? could you be supping? could he be supping? could we be supping? could you be supping? could they be supping?
Perfect	V-ing perfect
could I have supped? could you have supped? could he have supped? could we have supped? could you have supped? could they have supped?	could I have been supping? could you have been supping? could he have been supping? could we have been supping? could you have been supping? could they have been supping?

Interro-negative form

Simple form	V-ing form
couldn't I sup? couldn't you sup? couldn't he sup? couldn't we sup? couldn't you sup? couldn't they sup?	couldn't I be supping? couldn't you be supping? couldn't he be supping? couldn't we be supping? couldn't you be supping? couldn't they be supping?
Perfect	V-ing perfect
couldn't I have supped? couldn't you have supped? couldn't he have supped? couldn't we have supped? couldn't you have supped? couldn't they have supped?	couldn't I have been supping? couldn't you have been supping? couldn't he have been supping? couldn't we have been supping? couldn't you have been supping? couldn't they have been supping?