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 could not underprop you could not underprop he could not underprop we could not underprop you could not underprop they could not underprop	I could not be underproping you could not be underproping he could not be underproping we could not be underproping you could not be underproping they could not be underproping
Perfect	V-ing perfect
I could not have underproped you could not have underproped he could not have underproped we could not have underproped you could not have underproped they could not have underproped	I could not have been underproping you could not have been underproping he could not have been underproping we could not have been underproping you could not have been underproping they could not 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
could I not underprop? could you not underprop? could he not underprop? could we not underprop? could you not underprop? could they not underprop?	could I not be underproping? could you not be underproping? could he not be underproping? could we not be underproping? could you not be underproping? could they not be underproping?
Perfect	V-ing perfect
could I not have underproped? could you not have underproped? could he not have underproped? could we not have underproped? could you not have underproped? could they not have underproped?	could I not have been underproping? could you not have been underproping? could he not have been underproping? could we not have been underproping? could you not have been underproping? could they not have been underproping?