could upturn
Verbo regolare: upturn - upturned- upturned

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could upturn
you could upturn
she could upturn
we could upturn
you could upturn
they could upturn 	I could be upturning
you could be upturning
she could be upturning
we could be upturning
you could be upturning
they could be upturning	I could have upturned
you could have upturned
she 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
she could have been upturning
we could have been upturning
you could have been upturning
they could have been upturning	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not upturn
you could not upturn
she could not upturn
we could not upturn
you could not upturn
they could not upturn 	I could not be upturning
you could not be upturning
she could not be upturning
we could not be upturning
you could not be upturning
they could not be upturning	I could not have upturned
you could not have upturned
she could not have upturned
we could not have upturned
you could not have upturned
they could not have upturned	I could not have been upturning
you could not have been upturning
she could not have been upturning
we could not have been upturning
you could not have been upturning
they could not have been upturning	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I upturn?
could you upturn?
could she upturn?
could we upturn?
could you upturn?
could they upturn? 	could I be upturning?
could you be upturning?
could she be upturning?
could we be upturning?
could you be upturning?
could they be upturning? 	could I have upturned?
could you have upturned?
could she 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 she have been upturning?
could we have been upturning?
could you have been upturning?
could they have been upturning? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not upturn?
could you not upturn?
could she not upturn?
could we not upturn?
could you not upturn?
could they not upturn? 	could I not be upturning?
could you not be upturning?
could she not be upturning?
could we not be upturning?
could you not be upturning?
could they not be upturning? 	could I not have upturned?
could you not have upturned?
could she not have upturned?
could we not have upturned?
could you not have upturned?
could they not have upturned? 	could I not have been upturning?
could you not have been upturning?
could she not have been upturning?
could we not have been upturning?
could you not have been upturning?
could they not have been upturning?