could curve
Verbo regular: curve - curved- curved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could curve
you could curve
he could curve
we could curve
you could curve
they could curve 	I could be curving
you could be curving
he could be curving
we could be curving
you could be curving
they could be curving	I could have curved
you could have curved
he could have curved
we could have curved
you could have curved
they could have curved	I could have been curving
you could have been curving
he could have been curving
we could have been curving
you could have been curving
they could have been curving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not curve
you could not curve
he could not curve
we could not curve
you could not curve
they could not curve 	I could not be curving
you could not be curving
he could not be curving
we could not be curving
you could not be curving
they could not be curving	I could not have curved
you could not have curved
he could not have curved
we could not have curved
you could not have curved
they could not have curved	I could not have been curving
you could not have been curving
he could not have been curving
we could not have been curving
you could not have been curving
they could not have been curving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I curve?
could you curve?
could he curve?
could we curve?
could you curve?
could they curve? 	could I be curving?
could you be curving?
could he be curving?
could we be curving?
could you be curving?
could they be curving? 	could I have curved?
could you have curved?
could he have curved?
could we have curved?
could you have curved?
could they have curved? 	could I have been curving?
could you have been curving?
could he have been curving?
could we have been curving?
could you have been curving?
could they have been curving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not curve?
could you not curve?
could he not curve?
could we not curve?
could you not curve?
could they not curve? 	could I not be curving?
could you not be curving?
could he not be curving?
could we not be curving?
could you not be curving?
could they not be curving? 	could I not have curved?
could you not have curved?
could he not have curved?
could we not have curved?
could you not have curved?
could they not have curved? 	could I not have been curving?
could you not have been curving?
could he not have been curving?
could we not have been curving?
could you not have been curving?
could they not have been curving?