can darken
Verbo regular: darken - darkened- darkened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can darken
you can darken
he can darken
we can darken
you can darken
they can darken 	I can be darkening
you can be darkening
he can be darkening
we can be darkening
you can be darkening
they can be darkening	I can have darkened
you can have darkened
he can have darkened
we can have darkened
you can have darkened
they can have darkened	I can have been darkening
you can have been darkening
he can have been darkening
we can have been darkening
you can have been darkening
they can have been darkening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't darken
you can't darken
he can't darken
we can't darken
you can't darken
they can't darken 	I can't be darkening
you can't be darkening
he can't be darkening
we can't be darkening
you can't be darkening
they can't be darkening	I can't have darkened
you can't have darkened
he can't have darkened
we can't have darkened
you can't have darkened
they can't have darkened	I can't have been darkening
you can't have been darkening
he can't have been darkening
we can't have been darkening
you can't have been darkening
they can't have been darkening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I darken?
can you darken?
can he darken?
can we darken?
can you darken?
can they darken? 	can I be darkening?
can you be darkening?
can he be darkening?
can we be darkening?
can you be darkening?
can they be darkening? 	can I have darkened?
can you have darkened?
can he have darkened?
can we have darkened?
can you have darkened?
can they have darkened? 	can I have been darkening?
can you have been darkening?
can he have been darkening?
can we have been darkening?
can you have been darkening?
can they have been darkening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I darken?
can't you darken?
can't he darken?
can't we darken?
can't you darken?
can't they darken? 	can't I be darkening?
can't you be darkening?
can't he be darkening?
can't we be darkening?
can't you be darkening?
can't they be darkening? 	can't I have darkened?
can't you have darkened?
can't he have darkened?
can't we have darkened?
can't you have darkened?
can't they have darkened? 	can't I have been darkening?
can't you have been darkening?
can't he have been darkening?
can't we have been darkening?
can't you have been darkening?
can't they have been darkening?