must develop
Verbe régulier : develop - developed- developed
Traduction française : se développer - développer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must develop
you must develop
he must develop
we must develop
you must develop
they must develop 	I must be developing
you must be developing
he must be developing
we must be developing
you must be developing
they must be developing	I must have developed
you must have developed
he must have developed
we must have developed
you must have developed
they must have developed	I must have been developing
you must have been developing
he must have been developing
we must have been developing
you must have been developing
they must have been developing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't develop
you mustn't develop
he mustn't develop
we mustn't develop
you mustn't develop
they mustn't develop 	I mustn't be developing
you mustn't be developing
he mustn't be developing
we mustn't be developing
you mustn't be developing
they mustn't be developing	I mustn't have developed
you mustn't have developed
he mustn't have developed
we mustn't have developed
you mustn't have developed
they mustn't have developed	I mustn't have been developing
you mustn't have been developing
he mustn't have been developing
we mustn't have been developing
you mustn't have been developing
they mustn't have been developing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I develop?
must you develop?
must he develop?
must we develop?
must you develop?
must they develop? 	must I be developing?
must you be developing?
must he be developing?
must we be developing?
must you be developing?
must they be developing? 	must I have developed?
must you have developed?
must he have developed?
must we have developed?
must you have developed?
must they have developed? 	must I have been developing?
must you have been developing?
must he have been developing?
must we have been developing?
must you have been developing?
must they have been developing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I develop?
mustn't you develop?
mustn't he develop?
mustn't we develop?
mustn't you develop?
mustn't they develop? 	mustn't I be developing?
mustn't you be developing?
mustn't he be developing?
mustn't we be developing?
mustn't you be developing?
mustn't they be developing? 	mustn't I have developed?
mustn't you have developed?
mustn't he have developed?
mustn't we have developed?
mustn't you have developed?
mustn't they have developed? 	mustn't I have been developing?
mustn't you have been developing?
mustn't he have been developing?
mustn't we have been developing?
mustn't you have been developing?
mustn't they have been developing?