can curve
Verbo regular: curve - curved- curved

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can curve
you can curve
he can curve
we can curve
you can curve
they can curve 	I can be curving
you can be curving
he can be curving
we can be curving
you can be curving
they can be curving	I can have curved
you can have curved
he can have curved
we can have curved
you can have curved
they can have curved	I can have been curving
you can have been curving
he can have been curving
we can have been curving
you can have been curving
they can have been curving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot curve
you cannot curve
he cannot curve
we cannot curve
you cannot curve
they cannot curve 	I cannot be curving
you cannot be curving
he cannot be curving
we cannot be curving
you cannot be curving
they cannot be curving	I cannot have curved
you cannot have curved
he cannot have curved
we cannot have curved
you cannot have curved
they cannot have curved	I cannot have been curving
you cannot have been curving
he cannot have been curving
we cannot have been curving
you cannot have been curving
they cannot have been curving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I curve?
can you curve?
can he curve?
can we curve?
can you curve?
can they curve? 	can I be curving?
can you be curving?
can he be curving?
can we be curving?
can you be curving?
can they be curving? 	can I have curved?
can you have curved?
can he have curved?
can we have curved?
can you have curved?
can they have curved? 	can I have been curving?
can you have been curving?
can he have been curving?
can we have been curving?
can you have been curving?
can they have been curving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not curve?
can you not curve?
can he not curve?
can we not curve?
can you not curve?
can they not curve? 	can I not be curving?
can you not be curving?
can he not be curving?
can we not be curving?
can you not be curving?
can they not be curving? 	can I not have curved?
can you not have curved?
can he not have curved?
can we not have curved?
can you not have curved?
can they not have curved? 	can I not have been curving?
can you not have been curving?
can he not have been curving?
can we not have been curving?
can you not have been curving?
can they not have been curving?