could underrun
Verbe irrégulier : underrun - underran- underrun

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could underrun
you could underrun
he could underrun
we could underrun
you could underrun
they could underrun 	I could be underruning
you could be underruning
he could be underruning
we could be underruning
you could be underruning
they could be underruning	I could have underrun
you could have underrun
he could have underrun
we could have underrun
you could have underrun
they could have underrun	I could have been underruning
you could have been underruning
he could have been underruning
we could have been underruning
you could have been underruning
they could have been underruning	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't underrun
you couldn't underrun
he couldn't underrun
we couldn't underrun
you couldn't underrun
they couldn't underrun 	I couldn't be underruning
you couldn't be underruning
he couldn't be underruning
we couldn't be underruning
you couldn't be underruning
they couldn't be underruning	I couldn't have underrun
you couldn't have underrun
he couldn't have underrun
we couldn't have underrun
you couldn't have underrun
they couldn't have underrun	I couldn't have been underruning
you couldn't have been underruning
he couldn't have been underruning
we couldn't have been underruning
you couldn't have been underruning
they couldn't have been underruning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I underrun?
could you underrun?
could he underrun?
could we underrun?
could you underrun?
could they underrun? 	could I be underruning?
could you be underruning?
could he be underruning?
could we be underruning?
could you be underruning?
could they be underruning? 	could I have underrun?
could you have underrun?
could he have underrun?
could we have underrun?
could you have underrun?
could they have underrun? 	could I have been underruning?
could you have been underruning?
could he have been underruning?
could we have been underruning?
could you have been underruning?
could they have been underruning? 	

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