must befall
Verbe irrégulier : befall - befell- befallen
Traduction française : arriver à - arriver 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must befall
you must befall
she must befall
we must befall
you must befall
they must befall 	I must be befalling
you must be befalling
she must be befalling
we must be befalling
you must be befalling
they must be befalling	I must have befallen
you must have befallen
she 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
she must have been befalling
we must have been befalling
you must have been befalling
they must have been befalling	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't befall
you mustn't befall
she mustn't befall
we mustn't befall
you mustn't befall
they mustn't befall 	I mustn't be befalling
you mustn't be befalling
she mustn't be befalling
we mustn't be befalling
you mustn't be befalling
they mustn't be befalling	I mustn't have befallen
you mustn't have befallen
she mustn't have befallen
we mustn't have befallen
you mustn't have befallen
they mustn't have befallen	I mustn't have been befalling
you mustn't have been befalling
she mustn't have been befalling
we mustn't have been befalling
you mustn't have been befalling
they mustn't have been befalling	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I befall?
must you befall?
must she befall?
must we befall?
must you befall?
must they befall? 	must I be befalling?
must you be befalling?
must she be befalling?
must we be befalling?
must you be befalling?
must they be befalling? 	must I have befallen?
must you have befallen?
must she 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 she have been befalling?
must we have been befalling?
must you have been befalling?
must they have been befalling? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I befall?
mustn't you befall?
mustn't she befall?
mustn't we befall?
mustn't you befall?
mustn't they befall? 	mustn't I be befalling?
mustn't you be befalling?
mustn't she be befalling?
mustn't we be befalling?
mustn't you be befalling?
mustn't they be befalling? 	mustn't I have befallen?
mustn't you have befallen?
mustn't she have befallen?
mustn't we have befallen?
mustn't you have befallen?
mustn't they have befallen? 	mustn't I have been befalling?
mustn't you have been befalling?
mustn't she have been befalling?
mustn't we have been befalling?
mustn't you have been befalling?
mustn't they have been befalling?