can lighten
Verbo regular: lighten - lightened- lightened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can lighten
you can lighten
he can lighten
we can lighten
you can lighten
they can lighten 	I can be lightening
you can be lightening
he can be lightening
we can be lightening
you can be lightening
they can be lightening	I can have lightened
you can have lightened
he can have lightened
we can have lightened
you can have lightened
they can have lightened	I can have been lightening
you can have been lightening
he can have been lightening
we can have been lightening
you can have been lightening
they can have been lightening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't lighten
you can't lighten
he can't lighten
we can't lighten
you can't lighten
they can't lighten 	I can't be lightening
you can't be lightening
he can't be lightening
we can't be lightening
you can't be lightening
they can't be lightening	I can't have lightened
you can't have lightened
he can't have lightened
we can't have lightened
you can't have lightened
they can't have lightened	I can't have been lightening
you can't have been lightening
he can't have been lightening
we can't have been lightening
you can't have been lightening
they can't have been lightening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I lighten?
can you lighten?
can he lighten?
can we lighten?
can you lighten?
can they lighten? 	can I be lightening?
can you be lightening?
can he be lightening?
can we be lightening?
can you be lightening?
can they be lightening? 	can I have lightened?
can you have lightened?
can he have lightened?
can we have lightened?
can you have lightened?
can they have lightened? 	can I have been lightening?
can you have been lightening?
can he have been lightening?
can we have been lightening?
can you have been lightening?
can they have been lightening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I lighten?
can't you lighten?
can't he lighten?
can't we lighten?
can't you lighten?
can't they lighten? 	can't I be lightening?
can't you be lightening?
can't he be lightening?
can't we be lightening?
can't you be lightening?
can't they be lightening? 	can't I have lightened?
can't you have lightened?
can't he have lightened?
can't we have lightened?
can't you have lightened?
can't they have lightened? 	can't I have been lightening?
can't you have been lightening?
can't he have been lightening?
can't we have been lightening?
can't you have been lightening?
can't they have been lightening?