can underprop
Regular verb: underprop - underproped- underproped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can underprop
you can underprop
she can underprop
we can underprop
you can underprop
they can underprop 	I can be underproping
you can be underproping
she can be underproping
we can be underproping
you can be underproping
they can be underproping	I can have underproped
you can have underproped
she 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
she 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 cannot underprop
you cannot underprop
she cannot underprop
we cannot underprop
you cannot underprop
they cannot underprop 	I cannot be underproping
you cannot be underproping
she cannot be underproping
we cannot be underproping
you cannot be underproping
they cannot be underproping	I cannot have underproped
you cannot have underproped
she 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
she 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 	Perfect 	V-ing perfect 	
can I underprop?
can you underprop?
can she underprop?
can we underprop?
can you underprop?
can they underprop? 	can I be underproping?
can you be underproping?
can she be underproping?
can we be underproping?
can you be underproping?
can they be underproping? 	can I have underproped?
can you have underproped?
can she 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 she 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 I not underprop?
can you not underprop?
can she 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 she not be underproping?
can we not be underproping?
can you not be underproping?
can they not be underproping? 	can I not have underproped?
can you not have underproped?
can she 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 she not have been underproping?
can we not have been underproping?
can you not have been underproping?
can they not have been underproping?