could shriek
Verbo regular: shriek - shrieked- shrieked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shriek
you could shriek
he could shriek
we could shriek
you could shriek
they could shriek 	I could be shrieking
you could be shrieking
he could be shrieking
we could be shrieking
you could be shrieking
they could be shrieking	I could have shrieked
you could have shrieked
he could have shrieked
we could have shrieked
you could have shrieked
they could have shrieked	I could have been shrieking
you could have been shrieking
he could have been shrieking
we could have been shrieking
you could have been shrieking
they could have been shrieking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not shriek
you could not shriek
he could not shriek
we could not shriek
you could not shriek
they could not shriek 	I could not be shrieking
you could not be shrieking
he could not be shrieking
we could not be shrieking
you could not be shrieking
they could not be shrieking	I could not have shrieked
you could not have shrieked
he could not have shrieked
we could not have shrieked
you could not have shrieked
they could not have shrieked	I could not have been shrieking
you could not have been shrieking
he could not have been shrieking
we could not have been shrieking
you could not have been shrieking
they could not have been shrieking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shriek?
could you shriek?
could he shriek?
could we shriek?
could you shriek?
could they shriek? 	could I be shrieking?
could you be shrieking?
could he be shrieking?
could we be shrieking?
could you be shrieking?
could they be shrieking? 	could I have shrieked?
could you have shrieked?
could he have shrieked?
could we have shrieked?
could you have shrieked?
could they have shrieked? 	could I have been shrieking?
could you have been shrieking?
could he have been shrieking?
could we have been shrieking?
could you have been shrieking?
could they have been shrieking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not shriek?
could you not shriek?
could he not shriek?
could we not shriek?
could you not shriek?
could they not shriek? 	could I not be shrieking?
could you not be shrieking?
could he not be shrieking?
could we not be shrieking?
could you not be shrieking?
could they not be shrieking? 	could I not have shrieked?
could you not have shrieked?
could he not have shrieked?
could we not have shrieked?
could you not have shrieked?
could they not have shrieked? 	could I not have been shrieking?
could you not have been shrieking?
could he not have been shrieking?
could we not have been shrieking?
could you not have been shrieking?
could they not have been shrieking?