can upturn
Verbo regular: upturn - upturned- upturned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can upturn
you can upturn
he can upturn
we can upturn
you can upturn
they can upturn 	I can be upturning
you can be upturning
he can be upturning
we can be upturning
you can be upturning
they can be upturning	I can have upturned
you can have upturned
he can have upturned
we can have upturned
you can have upturned
they can have upturned	I can have been upturning
you can have been upturning
he can have been upturning
we can have been upturning
you can have been upturning
they can have been upturning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot upturn
you cannot upturn
he cannot upturn
we cannot upturn
you cannot upturn
they cannot upturn 	I cannot be upturning
you cannot be upturning
he cannot be upturning
we cannot be upturning
you cannot be upturning
they cannot be upturning	I cannot have upturned
you cannot have upturned
he cannot have upturned
we cannot have upturned
you cannot have upturned
they cannot have upturned	I cannot have been upturning
you cannot have been upturning
he cannot have been upturning
we cannot have been upturning
you cannot have been upturning
they cannot have been upturning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I upturn?
can you upturn?
can he upturn?
can we upturn?
can you upturn?
can they upturn? 	can I be upturning?
can you be upturning?
can he be upturning?
can we be upturning?
can you be upturning?
can they be upturning? 	can I have upturned?
can you have upturned?
can he have upturned?
can we have upturned?
can you have upturned?
can they have upturned? 	can I have been upturning?
can you have been upturning?
can he have been upturning?
can we have been upturning?
can you have been upturning?
can they have been upturning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not upturn?
can you not upturn?
can he not upturn?
can we not upturn?
can you not upturn?
can they not upturn? 	can I not be upturning?
can you not be upturning?
can he not be upturning?
can we not be upturning?
can you not be upturning?
can they not be upturning? 	can I not have upturned?
can you not have upturned?
can he not have upturned?
can we not have upturned?
can you not have upturned?
can they not have upturned? 	can I not have been upturning?
can you not have been upturning?
can he not have been upturning?
can we not have been upturning?
can you not have been upturning?
can they not have been upturning?