must exist
Verbe régulier : exist - existed- existed
Traduction française : exister 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must exist
you must exist
he must exist
we must exist
you must exist
they must exist 	I must be existing
you must be existing
he must be existing
we must be existing
you must be existing
they must be existing	I must have existed
you must have existed
he must have existed
we must have existed
you must have existed
they must have existed	I must have been existing
you must have been existing
he must have been existing
we must have been existing
you must have been existing
they must have been existing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't exist
you mustn't exist
he mustn't exist
we mustn't exist
you mustn't exist
they mustn't exist 	I mustn't be existing
you mustn't be existing
he mustn't be existing
we mustn't be existing
you mustn't be existing
they mustn't be existing	I mustn't have existed
you mustn't have existed
he mustn't have existed
we mustn't have existed
you mustn't have existed
they mustn't have existed	I mustn't have been existing
you mustn't have been existing
he mustn't have been existing
we mustn't have been existing
you mustn't have been existing
they mustn't have been existing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I exist?
must you exist?
must he exist?
must we exist?
must you exist?
must they exist? 	must I be existing?
must you be existing?
must he be existing?
must we be existing?
must you be existing?
must they be existing? 	must I have existed?
must you have existed?
must he have existed?
must we have existed?
must you have existed?
must they have existed? 	must I have been existing?
must you have been existing?
must he have been existing?
must we have been existing?
must you have been existing?
must they have been existing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I exist?
mustn't you exist?
mustn't he exist?
mustn't we exist?
mustn't you exist?
mustn't they exist? 	mustn't I be existing?
mustn't you be existing?
mustn't he be existing?
mustn't we be existing?
mustn't you be existing?
mustn't they be existing? 	mustn't I have existed?
mustn't you have existed?
mustn't he have existed?
mustn't we have existed?
mustn't you have existed?
mustn't they have existed? 	mustn't I have been existing?
mustn't you have been existing?
mustn't he have been existing?
mustn't we have been existing?
mustn't you have been existing?
mustn't they have been existing?