could undo
Verbo irregular: undo - undid- undone

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could undo
you could undo
she could undo
we could undo
you could undo
they could undo 	I could be undoing
you could be undoing
she could be undoing
we could be undoing
you could be undoing
they could be undoing	I could have undone
you could have undone
she 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
she could have been undoing
we could have been undoing
you could have been undoing
they could have been undoing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not undo
you could not undo
she could not undo
we could not undo
you could not undo
they could not undo 	I could not be undoing
you could not be undoing
she could not be undoing
we could not be undoing
you could not be undoing
they could not be undoing	I could not have undone
you could not have undone
she could not have undone
we could not have undone
you could not have undone
they could not have undone	I could not have been undoing
you could not have been undoing
she could not have been undoing
we could not have been undoing
you could not have been undoing
they could not have been undoing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I undo?
could you undo?
could she undo?
could we undo?
could you undo?
could they undo? 	could I be undoing?
could you be undoing?
could she be undoing?
could we be undoing?
could you be undoing?
could they be undoing? 	could I have undone?
could you have undone?
could she 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 she have been undoing?
could we have been undoing?
could you have been undoing?
could they have been undoing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not undo?
could you not undo?
could she not undo?
could we not undo?
could you not undo?
could they not undo? 	could I not be undoing?
could you not be undoing?
could she not be undoing?
could we not be undoing?
could you not be undoing?
could they not be undoing? 	could I not have undone?
could you not have undone?
could she not have undone?
could we not have undone?
could you not have undone?
could they not have undone? 	could I not have been undoing?
could you not have been undoing?
could she not have been undoing?
could we not have been undoing?
could you not have been undoing?
could they not have been undoing?