could undo
Verbo irregular: undo - undid- undone

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could undo
you could undo
he could undo
we could undo
you could undo
they could undo 	I could be undoing
you could be undoing
he could be undoing
we could be undoing
you could be undoing
they could be undoing	I could have undone
you could have undone
he could have undone
we could have undone
you could have undone
they could have undone	I could have been undoing
you could have been undoing
he could have been undoing
we could have been undoing
you could have been undoing
they could have been undoing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't undo
you couldn't undo
he couldn't undo
we couldn't undo
you couldn't undo
they couldn't undo 	I couldn't be undoing
you couldn't be undoing
he couldn't be undoing
we couldn't be undoing
you couldn't be undoing
they couldn't be undoing	I couldn't have undone
you couldn't have undone
he couldn't have undone
we couldn't have undone
you couldn't have undone
they couldn't have undone	I couldn't have been undoing
you couldn't have been undoing
he couldn't have been undoing
we couldn't have been undoing
you couldn't have been undoing
they couldn't have been undoing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I undo?
could you undo?
could he undo?
could we undo?
could you undo?
could they undo? 	could I be undoing?
could you be undoing?
could he be undoing?
could we be undoing?
could you be undoing?
could they be undoing? 	could I have undone?
could you have undone?
could he have undone?
could we have undone?
could you have undone?
could they have undone? 	could I have been undoing?
could you have been undoing?
could he have been undoing?
could we have been undoing?
could you have been undoing?
could they have been undoing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I undo?
couldn't you undo?
couldn't he undo?
couldn't we undo?
couldn't you undo?
couldn't they undo? 	couldn't I be undoing?
couldn't you be undoing?
couldn't he be undoing?
couldn't we be undoing?
couldn't you be undoing?
couldn't they be undoing? 	couldn't I have undone?
couldn't you have undone?
couldn't he have undone?
couldn't we have undone?
couldn't you have undone?
couldn't they have undone? 	couldn't I have been undoing?
couldn't you have been undoing?
couldn't he have been undoing?
couldn't we have been undoing?
couldn't you have been undoing?
couldn't they have been undoing?