could turn
Verbo regular: turn - turned- turned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could turn
you could turn
he could turn
we could turn
you could turn
they could turn 	I could be turning
you could be turning
he could be turning
we could be turning
you could be turning
they could be turning	I could have turned
you could have turned
he could have turned
we could have turned
you could have turned
they could have turned	I could have been turning
you could have been turning
he could have been turning
we could have been turning
you could have been turning
they could have been turning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not turn
you could not turn
he could not turn
we could not turn
you could not turn
they could not turn 	I could not be turning
you could not be turning
he could not be turning
we could not be turning
you could not be turning
they could not be turning	I could not have turned
you could not have turned
he could not have turned
we could not have turned
you could not have turned
they could not have turned	I could not have been turning
you could not have been turning
he could not have been turning
we could not have been turning
you could not have been turning
they could not have been turning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I turn?
could you turn?
could he turn?
could we turn?
could you turn?
could they turn? 	could I be turning?
could you be turning?
could he be turning?
could we be turning?
could you be turning?
could they be turning? 	could I have turned?
could you have turned?
could he have turned?
could we have turned?
could you have turned?
could they have turned? 	could I have been turning?
could you have been turning?
could he have been turning?
could we have been turning?
could you have been turning?
could they have been turning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not turn?
could you not turn?
could he not turn?
could we not turn?
could you not turn?
could they not turn? 	could I not be turning?
could you not be turning?
could he not be turning?
could we not be turning?
could you not be turning?
could they not be turning? 	could I not have turned?
could you not have turned?
could he not have turned?
could we not have turned?
could you not have turned?
could they not have turned? 	could I not have been turning?
could you not have been turning?
could he not have been turning?
could we not have been turning?
could you not have been turning?
could they not have been turning?