could turn
Verbo regular: turn - turned- turned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could turn
you could turn
she could turn
we could turn
you could turn
they could turn 	I could be turning
you could be turning
she could be turning
we could be turning
you could be turning
they could be turning	I could have turned
you could have turned
she 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
she could have been turning
we could have been turning
you could have been turning
they could have been turning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not turn
you could not turn
she 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
she 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
she 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
she 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 com V-ing 	Perfeito 	Perfeito com V-ing 	
could I turn?
could you turn?
could she turn?
could we turn?
could you turn?
could they turn? 	could I be turning?
could you be turning?
could she be turning?
could we be turning?
could you be turning?
could they be turning? 	could I have turned?
could you have turned?
could she 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 she have been turning?
could we have been turning?
could you have been turning?
could they have been turning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not turn?
could you not turn?
could she 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 she 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 she 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 she not have been turning?
could we not have been turning?
could you not have been turning?
could they not have been turning?