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