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