I must produce you must produce he must produce we must produce you must produce they must produce
V-ing form
I must be producing you must be producing he must be producing we must be producing you must be producing they must be producing
Perfect
I must have produced you must have produced he must have produced we must have produced you must have produced they must have produced
V-ing perfect
I must have been producing you must have been producing he must have been producing we must have been producing you must have been producing they must have been producing
Negation
Simple form
I mustn't produce you mustn't produce he mustn't produce we mustn't produce you mustn't produce they mustn't produce
V-ing form
I mustn't be producing you mustn't be producing he mustn't be producing we mustn't be producing you mustn't be producing they mustn't be producing
Perfect
I mustn't have produced you mustn't have produced he mustn't have produced we mustn't have produced you mustn't have produced they mustn't have produced
V-ing perfect
I mustn't have been producing you mustn't have been producing he mustn't have been producing we mustn't have been producing you mustn't have been producing they mustn't have been producing
Interrogative form
Simple form
must I produce? must you produce? must he produce? must we produce? must you produce? must they produce?
V-ing form
must I be producing? must you be producing? must he be producing? must we be producing? must you be producing? must they be producing?
Perfect
must I have produced? must you have produced? must he have produced? must we have produced? must you have produced? must they have produced?
V-ing perfect
must I have been producing? must you have been producing? must he have been producing? must we have been producing? must you have been producing? must they have been producing?
Interro-negative form
Simple form
mustn't I produce? mustn't you produce? mustn't he produce? mustn't we produce? mustn't you produce? mustn't they produce?
V-ing form
mustn't I be producing? mustn't you be producing? mustn't he be producing? mustn't we be producing? mustn't you be producing? mustn't they be producing?
Perfect
mustn't I have produced? mustn't you have produced? mustn't he have produced? mustn't we have produced? mustn't you have produced? mustn't they have produced?
V-ing perfect
mustn't I have been producing? mustn't you have been producing? mustn't he have been producing? mustn't we have been producing? mustn't you have been producing? mustn't they have been producing?