should underprop
Regular verb: underprop - underproped- underproped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd underprop
you'd underprop
he'd underprop
we'd underprop
you'd underprop
they'd underprop 	I'd be underproping
you'd be underproping
he'd be underproping
we'd be underproping
you'd be underproping
they'd be underproping	I should've underproped
you should've underproped
he should've underproped
we should've underproped
you should've underproped
they should've underproped	I should've been underproping
you should've been underproping
he should've been underproping
we should've been underproping
you should've been underproping
they should've been underproping	

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

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

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