must befall
Verbo irregular: befall - befell- befallen

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must befall
you must befall
he must befall
we must befall
you must befall
they must befall 	I must be befalling
you must be befalling
he must be befalling
we must be befalling
you must be befalling
they must be befalling	I must have befallen
you must have befallen
he must have befallen
we must have befallen
you must have befallen
they must have befallen	I must have been befalling
you must have been befalling
he must have been befalling
we must have been befalling
you must have been befalling
they must have been befalling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not befall
you must not befall
he must not befall
we must not befall
you must not befall
they must not befall 	I must not be befalling
you must not be befalling
he must not be befalling
we must not be befalling
you must not be befalling
they must not be befalling	I must not have befallen
you must not have befallen
he must not have befallen
we must not have befallen
you must not have befallen
they must not have befallen	I must not have been befalling
you must not have been befalling
he must not have been befalling
we must not have been befalling
you must not have been befalling
they must not have been befalling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I befall?
must you befall?
must he befall?
must we befall?
must you befall?
must they befall? 	must I be befalling?
must you be befalling?
must he be befalling?
must we be befalling?
must you be befalling?
must they be befalling? 	must I have befallen?
must you have befallen?
must he have befallen?
must we have befallen?
must you have befallen?
must they have befallen? 	must I have been befalling?
must you have been befalling?
must he have been befalling?
must we have been befalling?
must you have been befalling?
must they have been befalling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not befall?
must you not befall?
must he not befall?
must we not befall?
must you not befall?
must they not befall? 	must I not be befalling?
must you not be befalling?
must he not be befalling?
must we not be befalling?
must you not be befalling?
must they not be befalling? 	must I not have befallen?
must you not have befallen?
must he not have befallen?
must we not have befallen?
must you not have befallen?
must they not have befallen? 	must I not have been befalling?
must you not have been befalling?
must he not have been befalling?
must we not have been befalling?
must you not have been befalling?
must they not have been befalling?