could curb
Verbo regular: curb - curbed- curbed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could curb
you could curb
he could curb
we could curb
you could curb
they could curb 	I could be curbing
you could be curbing
he could be curbing
we could be curbing
you could be curbing
they could be curbing	I could have curbed
you could have curbed
he could have curbed
we could have curbed
you could have curbed
they could have curbed	I could have been curbing
you could have been curbing
he could have been curbing
we could have been curbing
you could have been curbing
they could have been curbing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not curb
you could not curb
he could not curb
we could not curb
you could not curb
they could not curb 	I could not be curbing
you could not be curbing
he could not be curbing
we could not be curbing
you could not be curbing
they could not be curbing	I could not have curbed
you could not have curbed
he could not have curbed
we could not have curbed
you could not have curbed
they could not have curbed	I could not have been curbing
you could not have been curbing
he could not have been curbing
we could not have been curbing
you could not have been curbing
they could not have been curbing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I curb?
could you curb?
could he curb?
could we curb?
could you curb?
could they curb? 	could I be curbing?
could you be curbing?
could he be curbing?
could we be curbing?
could you be curbing?
could they be curbing? 	could I have curbed?
could you have curbed?
could he have curbed?
could we have curbed?
could you have curbed?
could they have curbed? 	could I have been curbing?
could you have been curbing?
could he have been curbing?
could we have been curbing?
could you have been curbing?
could they have been curbing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not curb?
could you not curb?
could he not curb?
could we not curb?
could you not curb?
could they not curb? 	could I not be curbing?
could you not be curbing?
could he not be curbing?
could we not be curbing?
could you not be curbing?
could they not be curbing? 	could I not have curbed?
could you not have curbed?
could he not have curbed?
could we not have curbed?
could you not have curbed?
could they not have curbed? 	could I not have been curbing?
could you not have been curbing?
could he not have been curbing?
could we not have been curbing?
could you not have been curbing?
could they not have been curbing?