English verb conjugation
CAN UNDERPROP

Regular verb: underprop - underproped - underproped

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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