could stymie
Regular verb: stymie - stymied- stymied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could stymie
you could stymie
he could stymie
we could stymie
you could stymie
they could stymie 	I could be stymying
you could be stymying
he could be stymying
we could be stymying
you could be stymying
they could be stymying	I could have stymied
you could have stymied
he could have stymied
we could have stymied
you could have stymied
they could have stymied	I could have been stymying
you could have been stymying
he could have been stymying
we could have been stymying
you could have been stymying
they could have been stymying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not stymie
you could not stymie
he could not stymie
we could not stymie
you could not stymie
they could not stymie 	I could not be stymying
you could not be stymying
he could not be stymying
we could not be stymying
you could not be stymying
they could not be stymying	I could not have stymied
you could not have stymied
he could not have stymied
we could not have stymied
you could not have stymied
they could not have stymied	I could not have been stymying
you could not have been stymying
he could not have been stymying
we could not have been stymying
you could not have been stymying
they could not have been stymying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I stymie?
could you stymie?
could he stymie?
could we stymie?
could you stymie?
could they stymie? 	could I be stymying?
could you be stymying?
could he be stymying?
could we be stymying?
could you be stymying?
could they be stymying? 	could I have stymied?
could you have stymied?
could he have stymied?
could we have stymied?
could you have stymied?
could they have stymied? 	could I have been stymying?
could you have been stymying?
could he have been stymying?
could we have been stymying?
could you have been stymying?
could they have been stymying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not stymie?
could you not stymie?
could he not stymie?
could we not stymie?
could you not stymie?
could they not stymie? 	could I not be stymying?
could you not be stymying?
could he not be stymying?
could we not be stymying?
could you not be stymying?
could they not be stymying? 	could I not have stymied?
could you not have stymied?
could he not have stymied?
could we not have stymied?
could you not have stymied?
could they not have stymied? 	could I not have been stymying?
could you not have been stymying?
could he not have been stymying?
could we not have been stymying?
could you not have been stymying?
could they not have been stymying?