must undo
Verbo irregular: undo - undid- undone

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

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not undo
you must not undo
he must not undo
we must not undo
you must not undo
they must not undo 	I must not be undoing
you must not be undoing
he must not be undoing
we must not be undoing
you must not be undoing
they must not be undoing	I must not have undone
you must not have undone
he must not have undone
we must not have undone
you must not have undone
they must not have undone	I must not have been undoing
you must not have been undoing
he must not have been undoing
we must not have been undoing
you must not have been undoing
they must not have been undoing	

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

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