could jitter
Verbo regular: jitter - jittered- jittered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could jitter
you could jitter
he could jitter
we could jitter
you could jitter
they could jitter 	I could be jittering
you could be jittering
he could be jittering
we could be jittering
you could be jittering
they could be jittering	I could have jittered
you could have jittered
he could have jittered
we could have jittered
you could have jittered
they could have jittered	I could have been jittering
you could have been jittering
he could have been jittering
we could have been jittering
you could have been jittering
they could have been jittering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't jitter
you couldn't jitter
he couldn't jitter
we couldn't jitter
you couldn't jitter
they couldn't jitter 	I couldn't be jittering
you couldn't be jittering
he couldn't be jittering
we couldn't be jittering
you couldn't be jittering
they couldn't be jittering	I couldn't have jittered
you couldn't have jittered
he couldn't have jittered
we couldn't have jittered
you couldn't have jittered
they couldn't have jittered	I couldn't have been jittering
you couldn't have been jittering
he couldn't have been jittering
we couldn't have been jittering
you couldn't have been jittering
they couldn't have been jittering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I jitter?
could you jitter?
could he jitter?
could we jitter?
could you jitter?
could they jitter? 	could I be jittering?
could you be jittering?
could he be jittering?
could we be jittering?
could you be jittering?
could they be jittering? 	could I have jittered?
could you have jittered?
could he have jittered?
could we have jittered?
could you have jittered?
could they have jittered? 	could I have been jittering?
could you have been jittering?
could he have been jittering?
could we have been jittering?
could you have been jittering?
could they have been jittering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I jitter?
couldn't you jitter?
couldn't he jitter?
couldn't we jitter?
couldn't you jitter?
couldn't they jitter? 	couldn't I be jittering?
couldn't you be jittering?
couldn't he be jittering?
couldn't we be jittering?
couldn't you be jittering?
couldn't they be jittering? 	couldn't I have jittered?
couldn't you have jittered?
couldn't he have jittered?
couldn't we have jittered?
couldn't you have jittered?
couldn't they have jittered? 	couldn't I have been jittering?
couldn't you have been jittering?
couldn't he have been jittering?
couldn't we have been jittering?
couldn't you have been jittering?
couldn't they have been jittering?