could upturn
Verbe régulier : upturn - upturned- upturned
Traduction française : retourner - mettre à l'envers 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could upturn
you could upturn
he could upturn
we could upturn
you could upturn
they could upturn 	I could be upturning
you could be upturning
he could be upturning
we could be upturning
you could be upturning
they could be upturning	I could have upturned
you could have upturned
he could have upturned
we could have upturned
you could have upturned
they could have upturned	I could have been upturning
you could have been upturning
he could have been upturning
we could have been upturning
you could have been upturning
they could have been upturning	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't upturn
you couldn't upturn
he couldn't upturn
we couldn't upturn
you couldn't upturn
they couldn't upturn 	I couldn't be upturning
you couldn't be upturning
he couldn't be upturning
we couldn't be upturning
you couldn't be upturning
they couldn't be upturning	I couldn't have upturned
you couldn't have upturned
he couldn't have upturned
we couldn't have upturned
you couldn't have upturned
they couldn't have upturned	I couldn't have been upturning
you couldn't have been upturning
he couldn't have been upturning
we couldn't have been upturning
you couldn't have been upturning
they couldn't have been upturning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I upturn?
could you upturn?
could he upturn?
could we upturn?
could you upturn?
could they upturn? 	could I be upturning?
could you be upturning?
could he be upturning?
could we be upturning?
could you be upturning?
could they be upturning? 	could I have upturned?
could you have upturned?
could he have upturned?
could we have upturned?
could you have upturned?
could they have upturned? 	could I have been upturning?
could you have been upturning?
could he have been upturning?
could we have been upturning?
could you have been upturning?
could they have been upturning? 	

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