can blacken
Verbo regular: blacken - blackened- blackened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can blacken
you can blacken
he can blacken
we can blacken
you can blacken
they can blacken 	I can be blackening
you can be blackening
he can be blackening
we can be blackening
you can be blackening
they can be blackening	I can have blackened
you can have blackened
he can have blackened
we can have blackened
you can have blackened
they can have blackened	I can have been blackening
you can have been blackening
he can have been blackening
we can have been blackening
you can have been blackening
they can have been blackening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't blacken
you can't blacken
he can't blacken
we can't blacken
you can't blacken
they can't blacken 	I can't be blackening
you can't be blackening
he can't be blackening
we can't be blackening
you can't be blackening
they can't be blackening	I can't have blackened
you can't have blackened
he can't have blackened
we can't have blackened
you can't have blackened
they can't have blackened	I can't have been blackening
you can't have been blackening
he can't have been blackening
we can't have been blackening
you can't have been blackening
they can't have been blackening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I blacken?
can you blacken?
can he blacken?
can we blacken?
can you blacken?
can they blacken? 	can I be blackening?
can you be blackening?
can he be blackening?
can we be blackening?
can you be blackening?
can they be blackening? 	can I have blackened?
can you have blackened?
can he have blackened?
can we have blackened?
can you have blackened?
can they have blackened? 	can I have been blackening?
can you have been blackening?
can he have been blackening?
can we have been blackening?
can you have been blackening?
can they have been blackening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I blacken?
can't you blacken?
can't he blacken?
can't we blacken?
can't you blacken?
can't they blacken? 	can't I be blackening?
can't you be blackening?
can't he be blackening?
can't we be blackening?
can't you be blackening?
can't they be blackening? 	can't I have blackened?
can't you have blackened?
can't he have blackened?
can't we have blackened?
can't you have blackened?
can't they have blackened? 	can't I have been blackening?
can't you have been blackening?
can't he have been blackening?
can't we have been blackening?
can't you have been blackening?
can't they have been blackening?