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