could stalk
Verbo regular: stalk - stalked- stalked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could stalk
you could stalk
he could stalk
we could stalk
you could stalk
they could stalk 	I could be stalking
you could be stalking
he could be stalking
we could be stalking
you could be stalking
they could be stalking	I could have stalked
you could have stalked
he could have stalked
we could have stalked
you could have stalked
they could have stalked	I could have been stalking
you could have been stalking
he could have been stalking
we could have been stalking
you could have been stalking
they could have been stalking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not stalk
you could not stalk
he could not stalk
we could not stalk
you could not stalk
they could not stalk 	I could not be stalking
you could not be stalking
he could not be stalking
we could not be stalking
you could not be stalking
they could not be stalking	I could not have stalked
you could not have stalked
he could not have stalked
we could not have stalked
you could not have stalked
they could not have stalked	I could not have been stalking
you could not have been stalking
he could not have been stalking
we could not have been stalking
you could not have been stalking
they could not have been stalking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I stalk?
could you stalk?
could he stalk?
could we stalk?
could you stalk?
could they stalk? 	could I be stalking?
could you be stalking?
could he be stalking?
could we be stalking?
could you be stalking?
could they be stalking? 	could I have stalked?
could you have stalked?
could he have stalked?
could we have stalked?
could you have stalked?
could they have stalked? 	could I have been stalking?
could you have been stalking?
could he have been stalking?
could we have been stalking?
could you have been stalking?
could they have been stalking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not stalk?
could you not stalk?
could he not stalk?
could we not stalk?
could you not stalk?
could they not stalk? 	could I not be stalking?
could you not be stalking?
could he not be stalking?
could we not be stalking?
could you not be stalking?
could they not be stalking? 	could I not have stalked?
could you not have stalked?
could he not have stalked?
could we not have stalked?
could you not have stalked?
could they not have stalked? 	could I not have been stalking?
could you not have been stalking?
could he not have been stalking?
could we not have been stalking?
could you not have been stalking?
could they not have been stalking?