must butterfly
Verbe régulier : butterfly - butterflied- butterflied

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must butterfly
you must butterfly
he must butterfly
we must butterfly
you must butterfly
they must butterfly 	I must be butterflying
you must be butterflying
he must be butterflying
we must be butterflying
you must be butterflying
they must be butterflying	I must have butterflied
you must have butterflied
he must have butterflied
we must have butterflied
you must have butterflied
they must have butterflied	I must have been butterflying
you must have been butterflying
he must have been butterflying
we must have been butterflying
you must have been butterflying
they must have been butterflying	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't butterfly
you mustn't butterfly
he mustn't butterfly
we mustn't butterfly
you mustn't butterfly
they mustn't butterfly 	I mustn't be butterflying
you mustn't be butterflying
he mustn't be butterflying
we mustn't be butterflying
you mustn't be butterflying
they mustn't be butterflying	I mustn't have butterflied
you mustn't have butterflied
he mustn't have butterflied
we mustn't have butterflied
you mustn't have butterflied
they mustn't have butterflied	I mustn't have been butterflying
you mustn't have been butterflying
he mustn't have been butterflying
we mustn't have been butterflying
you mustn't have been butterflying
they mustn't have been butterflying	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I butterfly?
must you butterfly?
must he butterfly?
must we butterfly?
must you butterfly?
must they butterfly? 	must I be butterflying?
must you be butterflying?
must he be butterflying?
must we be butterflying?
must you be butterflying?
must they be butterflying? 	must I have butterflied?
must you have butterflied?
must he have butterflied?
must we have butterflied?
must you have butterflied?
must they have butterflied? 	must I have been butterflying?
must you have been butterflying?
must he have been butterflying?
must we have been butterflying?
must you have been butterflying?
must they have been butterflying? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I butterfly?
mustn't you butterfly?
mustn't he butterfly?
mustn't we butterfly?
mustn't you butterfly?
mustn't they butterfly? 	mustn't I be butterflying?
mustn't you be butterflying?
mustn't he be butterflying?
mustn't we be butterflying?
mustn't you be butterflying?
mustn't they be butterflying? 	mustn't I have butterflied?
mustn't you have butterflied?
mustn't he have butterflied?
mustn't we have butterflied?
mustn't you have butterflied?
mustn't they have butterflied? 	mustn't I have been butterflying?
mustn't you have been butterflying?
mustn't he have been butterflying?
mustn't we have been butterflying?
mustn't you have been butterflying?
mustn't they have been butterflying?