could stroke
Verbo regular: stroke - stroked- stroked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could stroke
you could stroke
he could stroke
we could stroke
you could stroke
they could stroke 	I could be stroking
you could be stroking
he could be stroking
we could be stroking
you could be stroking
they could be stroking	I could have stroked
you could have stroked
he could have stroked
we could have stroked
you could have stroked
they could have stroked	I could have been stroking
you could have been stroking
he could have been stroking
we could have been stroking
you could have been stroking
they could have been stroking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't stroke
you couldn't stroke
he couldn't stroke
we couldn't stroke
you couldn't stroke
they couldn't stroke 	I couldn't be stroking
you couldn't be stroking
he couldn't be stroking
we couldn't be stroking
you couldn't be stroking
they couldn't be stroking	I couldn't have stroked
you couldn't have stroked
he couldn't have stroked
we couldn't have stroked
you couldn't have stroked
they couldn't have stroked	I couldn't have been stroking
you couldn't have been stroking
he couldn't have been stroking
we couldn't have been stroking
you couldn't have been stroking
they couldn't have been stroking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I stroke?
could you stroke?
could he stroke?
could we stroke?
could you stroke?
could they stroke? 	could I be stroking?
could you be stroking?
could he be stroking?
could we be stroking?
could you be stroking?
could they be stroking? 	could I have stroked?
could you have stroked?
could he have stroked?
could we have stroked?
could you have stroked?
could they have stroked? 	could I have been stroking?
could you have been stroking?
could he have been stroking?
could we have been stroking?
could you have been stroking?
could they have been stroking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I stroke?
couldn't you stroke?
couldn't he stroke?
couldn't we stroke?
couldn't you stroke?
couldn't they stroke? 	couldn't I be stroking?
couldn't you be stroking?
couldn't he be stroking?
couldn't we be stroking?
couldn't you be stroking?
couldn't they be stroking? 	couldn't I have stroked?
couldn't you have stroked?
couldn't he have stroked?
couldn't we have stroked?
couldn't you have stroked?
couldn't they have stroked? 	couldn't I have been stroking?
couldn't you have been stroking?
couldn't he have been stroking?
couldn't we have been stroking?
couldn't you have been stroking?
couldn't they have been stroking?