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