English verb conjugation
MUST DEVELOP

Regular verb: develop - developed - developed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?