must undress
Verbo regular: undress - undressed- undressed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must undress
you must undress
he must undress
we must undress
you must undress
they must undress 	I must be undressing
you must be undressing
he must be undressing
we must be undressing
you must be undressing
they must be undressing	I must have undressed
you must have undressed
he must have undressed
we must have undressed
you must have undressed
they must have undressed	I must have been undressing
you must have been undressing
he must have been undressing
we must have been undressing
you must have been undressing
they must have been undressing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not undress
you must not undress
he must not undress
we must not undress
you must not undress
they must not undress 	I must not be undressing
you must not be undressing
he must not be undressing
we must not be undressing
you must not be undressing
they must not be undressing	I must not have undressed
you must not have undressed
he must not have undressed
we must not have undressed
you must not have undressed
they must not have undressed	I must not have been undressing
you must not have been undressing
he must not have been undressing
we must not have been undressing
you must not have been undressing
they must not have been undressing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I undress?
must you undress?
must he undress?
must we undress?
must you undress?
must they undress? 	must I be undressing?
must you be undressing?
must he be undressing?
must we be undressing?
must you be undressing?
must they be undressing? 	must I have undressed?
must you have undressed?
must he have undressed?
must we have undressed?
must you have undressed?
must they have undressed? 	must I have been undressing?
must you have been undressing?
must he have been undressing?
must we have been undressing?
must you have been undressing?
must they have been undressing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not undress?
must you not undress?
must he not undress?
must we not undress?
must you not undress?
must they not undress? 	must I not be undressing?
must you not be undressing?
must he not be undressing?
must we not be undressing?
must you not be undressing?
must they not be undressing? 	must I not have undressed?
must you not have undressed?
must he not have undressed?
must we not have undressed?
must you not have undressed?
must they not have undressed? 	must I not have been undressing?
must you not have been undressing?
must he not have been undressing?
must we not have been undressing?
must you not have been undressing?
must they not have been undressing?