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