could stroke
Regular verb: stroke - stroked- stroked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not stroke
you could not stroke
he could not stroke
we could not stroke
you could not stroke
they could not stroke 	I could not be stroking
you could not be stroking
he could not be stroking
we could not be stroking
you could not be stroking
they could not be stroking	I could not have stroked
you could not have stroked
he could not have stroked
we could not have stroked
you could not have stroked
they could not have stroked	I could not have been stroking
you could not have been stroking
he could not have been stroking
we could not have been stroking
you could not have been stroking
they could not have been stroking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not stroke?
could you not stroke?
could he not stroke?
could we not stroke?
could you not stroke?
could they not stroke? 	could I not be stroking?
could you not be stroking?
could he not be stroking?
could we not be stroking?
could you not be stroking?
could they not be stroking? 	could I not have stroked?
could you not have stroked?
could he not have stroked?
could we not have stroked?
could you not have stroked?
could they not have stroked? 	could I not have been stroking?
could you not have been stroking?
could he not have been stroking?
could we not have been stroking?
could you not have been stroking?
could they not have been stroking?