must fall
Verbo irregular: fall - fell- fallen

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fall
you must fall
he must fall
we must fall
you must fall
they must fall 	I must be falling
you must be falling
he must be falling
we must be falling
you must be falling
they must be falling	I must have fallen
you must have fallen
he must have fallen
we must have fallen
you must have fallen
they must have fallen	I must have been falling
you must have been falling
he must have been falling
we must have been falling
you must have been falling
they must have been falling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't fall
you mustn't fall
he mustn't fall
we mustn't fall
you mustn't fall
they mustn't fall 	I mustn't be falling
you mustn't be falling
he mustn't be falling
we mustn't be falling
you mustn't be falling
they mustn't be falling	I mustn't have fallen
you mustn't have fallen
he mustn't have fallen
we mustn't have fallen
you mustn't have fallen
they mustn't have fallen	I mustn't have been falling
you mustn't have been falling
he mustn't have been falling
we mustn't have been falling
you mustn't have been falling
they mustn't have been falling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fall?
must you fall?
must he fall?
must we fall?
must you fall?
must they fall? 	must I be falling?
must you be falling?
must he be falling?
must we be falling?
must you be falling?
must they be falling? 	must I have fallen?
must you have fallen?
must he have fallen?
must we have fallen?
must you have fallen?
must they have fallen? 	must I have been falling?
must you have been falling?
must he have been falling?
must we have been falling?
must you have been falling?
must they have been falling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I fall?
mustn't you fall?
mustn't he fall?
mustn't we fall?
mustn't you fall?
mustn't they fall? 	mustn't I be falling?
mustn't you be falling?
mustn't he be falling?
mustn't we be falling?
mustn't you be falling?
mustn't they be falling? 	mustn't I have fallen?
mustn't you have fallen?
mustn't he have fallen?
mustn't we have fallen?
mustn't you have fallen?
mustn't they have fallen? 	mustn't I have been falling?
mustn't you have been falling?
mustn't he have been falling?
mustn't we have been falling?
mustn't you have been falling?
mustn't they have been falling?