could underprop
Verbe régulier : underprop - underproped- underproped

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could underprop
you could underprop
he could underprop
we could underprop
you could underprop
they could underprop 	I could be underproping
you could be underproping
he could be underproping
we could be underproping
you could be underproping
they could be underproping	I could have underproped
you could have underproped
he could have underproped
we could have underproped
you could have underproped
they could have underproped	I could have been underproping
you could have been underproping
he could have been underproping
we could have been underproping
you could have been underproping
they could have been underproping	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't underprop
you couldn't underprop
he couldn't underprop
we couldn't underprop
you couldn't underprop
they couldn't underprop 	I couldn't be underproping
you couldn't be underproping
he couldn't be underproping
we couldn't be underproping
you couldn't be underproping
they couldn't be underproping	I couldn't have underproped
you couldn't have underproped
he couldn't have underproped
we couldn't have underproped
you couldn't have underproped
they couldn't have underproped	I couldn't have been underproping
you couldn't have been underproping
he couldn't have been underproping
we couldn't have been underproping
you couldn't have been underproping
they couldn't have been underproping	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I underprop?
could you underprop?
could he underprop?
could we underprop?
could you underprop?
could they underprop? 	could I be underproping?
could you be underproping?
could he be underproping?
could we be underproping?
could you be underproping?
could they be underproping? 	could I have underproped?
could you have underproped?
could he have underproped?
could we have underproped?
could you have underproped?
could they have underproped? 	could I have been underproping?
could you have been underproping?
could he have been underproping?
could we have been underproping?
could you have been underproping?
could they have been underproping? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I underprop?
couldn't you underprop?
couldn't he underprop?
couldn't we underprop?
couldn't you underprop?
couldn't they underprop? 	couldn't I be underproping?
couldn't you be underproping?
couldn't he be underproping?
couldn't we be underproping?
couldn't you be underproping?
couldn't they be underproping? 	couldn't I have underproped?
couldn't you have underproped?
couldn't he have underproped?
couldn't we have underproped?
couldn't you have underproped?
couldn't they have underproped? 	couldn't I have been underproping?
couldn't you have been underproping?
couldn't he have been underproping?
couldn't we have been underproping?
couldn't you have been underproping?
couldn't they have been underproping?