can underprop
Regular verb: underprop - underproped- underproped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?