I must undo you must undo he must undo we must undo you must undo they must undo
Forma con V-ing
I must be undoing you must be undoing he must be undoing we must be undoing you must be undoing they must be undoing
Perfetto
I must have undone you must have undone he must have undone we must have undone you must have undone they must have undone
Perfetto con V-ing
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
Negazione
Forma semplice
I must not undo you must not undo he 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 he must not be undoing we must not be undoing you must not be undoing they must not be undoing
Perfetto
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
Perfetto con V-ing
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 semplice
must I undo? must you undo? must he undo? must we undo? must you undo? must they undo?
Forma con V-ing
must I be undoing? must you be undoing? must he be undoing? must we be undoing? must you be undoing? must they be undoing?
Perfetto
must I have undone? must you have undone? must he have undone? must we have undone? must you have undone? must they have undone?
Perfetto con V-ing
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 semplice
must I not undo? must you not undo? must he 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 he not be undoing? must we not be undoing? must you not be undoing? must they not be undoing?
Perfetto
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?
Perfetto con V-ing
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?