English verb conjugation
COULD UNDERPROP

Regular verb: underprop - underproped - underproped

Affirmation

Simple form	V-ing form
I could underprop you could underprop he could underprop we could underprop you could underprop they could underprop	I could be underproping you could be underproping he could be underproping we could be underproping you could be underproping they could be underproping
Perfect	V-ing perfect
I could have underproped you could have underproped he could have underproped we could have underproped you could have underproped they could have underproped	I could have been underproping you could have been underproping he could have been underproping we could have been underproping you could have been underproping they could have been underproping

Negation

Simple form	V-ing form
I couldn't underprop you couldn't underprop he couldn't underprop we couldn't underprop you couldn't underprop they couldn't underprop	I couldn't be underproping you couldn't be underproping he couldn't be underproping we couldn't be underproping you couldn't be underproping they couldn't be underproping
Perfect	V-ing perfect
I couldn't have underproped you couldn't have underproped he couldn't have underproped we couldn't have underproped you couldn't have underproped they couldn't have underproped	I couldn't have been underproping you couldn't have been underproping he couldn't have been underproping we couldn't have been underproping you couldn't have been underproping they couldn't have been underproping

Interrogative form

Simple form	V-ing form
could I underprop? could you underprop? could he underprop? could we underprop? could you underprop? could they underprop?	could I be underproping? could you be underproping? could he be underproping? could we be underproping? could you be underproping? could they be underproping?
Perfect	V-ing perfect
could I have underproped? could you have underproped? could he have underproped? could we have underproped? could you have underproped? could they have underproped?	could I have been underproping? could you have been underproping? could he have been underproping? could we have been underproping? could you have been underproping? could they have been underproping?

Interro-negative form

Simple form	V-ing form
couldn't I underprop? couldn't you underprop? couldn't he underprop? couldn't we underprop? couldn't you underprop? couldn't they underprop?	couldn't I be underproping? couldn't you be underproping? couldn't he be underproping? couldn't we be underproping? couldn't you be underproping? couldn't they be underproping?
Perfect	V-ing perfect
couldn't I have underproped? couldn't you have underproped? couldn't he have underproped? couldn't we have underproped? couldn't you have underproped? couldn't they have underproped?	couldn't I have been underproping? couldn't you have been underproping? couldn't he have been underproping? couldn't we have been underproping? couldn't you have been underproping? couldn't they have been underproping?