could petrify
Verbo regular: petrify - petrified- petrified

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could petrify
you could petrify
he could petrify
we could petrify
you could petrify
they could petrify 	I could be petrifying
you could be petrifying
he could be petrifying
we could be petrifying
you could be petrifying
they could be petrifying	I could have petrified
you could have petrified
he could have petrified
we could have petrified
you could have petrified
they could have petrified	I could have been petrifying
you could have been petrifying
he could have been petrifying
we could have been petrifying
you could have been petrifying
they could have been petrifying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not petrify
you could not petrify
he could not petrify
we could not petrify
you could not petrify
they could not petrify 	I could not be petrifying
you could not be petrifying
he could not be petrifying
we could not be petrifying
you could not be petrifying
they could not be petrifying	I could not have petrified
you could not have petrified
he could not have petrified
we could not have petrified
you could not have petrified
they could not have petrified	I could not have been petrifying
you could not have been petrifying
he could not have been petrifying
we could not have been petrifying
you could not have been petrifying
they could not have been petrifying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I petrify?
could you petrify?
could he petrify?
could we petrify?
could you petrify?
could they petrify? 	could I be petrifying?
could you be petrifying?
could he be petrifying?
could we be petrifying?
could you be petrifying?
could they be petrifying? 	could I have petrified?
could you have petrified?
could he have petrified?
could we have petrified?
could you have petrified?
could they have petrified? 	could I have been petrifying?
could you have been petrifying?
could he have been petrifying?
could we have been petrifying?
could you have been petrifying?
could they have been petrifying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not petrify?
could you not petrify?
could he not petrify?
could we not petrify?
could you not petrify?
could they not petrify? 	could I not be petrifying?
could you not be petrifying?
could he not be petrifying?
could we not be petrifying?
could you not be petrifying?
could they not be petrifying? 	could I not have petrified?
could you not have petrified?
could he not have petrified?
could we not have petrified?
could you not have petrified?
could they not have petrified? 	could I not have been petrifying?
could you not have been petrifying?
could he not have been petrifying?
could we not have been petrifying?
could you not have been petrifying?
could they not have been petrifying?