could vitrify
Verbo regular: vitrify - vitrified- vitrified

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could vitrify
you could vitrify
he could vitrify
we could vitrify
you could vitrify
they could vitrify 	I could be vitrifying
you could be vitrifying
he could be vitrifying
we could be vitrifying
you could be vitrifying
they could be vitrifying	I could have vitrified
you could have vitrified
he could have vitrified
we could have vitrified
you could have vitrified
they could have vitrified	I could have been vitrifying
you could have been vitrifying
he could have been vitrifying
we could have been vitrifying
you could have been vitrifying
they could have been vitrifying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not vitrify
you could not vitrify
he could not vitrify
we could not vitrify
you could not vitrify
they could not vitrify 	I could not be vitrifying
you could not be vitrifying
he could not be vitrifying
we could not be vitrifying
you could not be vitrifying
they could not be vitrifying	I could not have vitrified
you could not have vitrified
he could not have vitrified
we could not have vitrified
you could not have vitrified
they could not have vitrified	I could not have been vitrifying
you could not have been vitrifying
he could not have been vitrifying
we could not have been vitrifying
you could not have been vitrifying
they could not have been vitrifying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I vitrify?
could you vitrify?
could he vitrify?
could we vitrify?
could you vitrify?
could they vitrify? 	could I be vitrifying?
could you be vitrifying?
could he be vitrifying?
could we be vitrifying?
could you be vitrifying?
could they be vitrifying? 	could I have vitrified?
could you have vitrified?
could he have vitrified?
could we have vitrified?
could you have vitrified?
could they have vitrified? 	could I have been vitrifying?
could you have been vitrifying?
could he have been vitrifying?
could we have been vitrifying?
could you have been vitrifying?
could they have been vitrifying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not vitrify?
could you not vitrify?
could he not vitrify?
could we not vitrify?
could you not vitrify?
could they not vitrify? 	could I not be vitrifying?
could you not be vitrifying?
could he not be vitrifying?
could we not be vitrifying?
could you not be vitrifying?
could they not be vitrifying? 	could I not have vitrified?
could you not have vitrified?
could he not have vitrified?
could we not have vitrified?
could you not have vitrified?
could they not have vitrified? 	could I not have been vitrifying?
could you not have been vitrifying?
could he not have been vitrifying?
could we not have been vitrifying?
could you not have been vitrifying?
could they not have been vitrifying?