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