could stammer
Verbo regular: stammer - stammered- stammered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could stammer
you could stammer
he could stammer
we could stammer
you could stammer
they could stammer 	I could be stammering
you could be stammering
he could be stammering
we could be stammering
you could be stammering
they could be stammering	I could have stammered
you could have stammered
he could have stammered
we could have stammered
you could have stammered
they could have stammered	I could have been stammering
you could have been stammering
he could have been stammering
we could have been stammering
you could have been stammering
they could have been stammering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not stammer
you could not stammer
he could not stammer
we could not stammer
you could not stammer
they could not stammer 	I could not be stammering
you could not be stammering
he could not be stammering
we could not be stammering
you could not be stammering
they could not be stammering	I could not have stammered
you could not have stammered
he could not have stammered
we could not have stammered
you could not have stammered
they could not have stammered	I could not have been stammering
you could not have been stammering
he could not have been stammering
we could not have been stammering
you could not have been stammering
they could not have been stammering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I stammer?
could you stammer?
could he stammer?
could we stammer?
could you stammer?
could they stammer? 	could I be stammering?
could you be stammering?
could he be stammering?
could we be stammering?
could you be stammering?
could they be stammering? 	could I have stammered?
could you have stammered?
could he have stammered?
could we have stammered?
could you have stammered?
could they have stammered? 	could I have been stammering?
could you have been stammering?
could he have been stammering?
could we have been stammering?
could you have been stammering?
could they have been stammering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not stammer?
could you not stammer?
could he not stammer?
could we not stammer?
could you not stammer?
could they not stammer? 	could I not be stammering?
could you not be stammering?
could he not be stammering?
could we not be stammering?
could you not be stammering?
could they not be stammering? 	could I not have stammered?
could you not have stammered?
could he not have stammered?
could we not have stammered?
could you not have stammered?
could they not have stammered? 	could I not have been stammering?
could you not have been stammering?
could he not have been stammering?
could we not have been stammering?
could you not have been stammering?
could they not have been stammering?