I must discipline you must discipline she must discipline we must discipline you must discipline they must discipline
V-ing form
I must be disciplining you must be disciplining she must be disciplining we must be disciplining you must be disciplining they must be disciplining
Perfect
I must have disciplined you must have disciplined she 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 she 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 she 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 she 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 she 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 she 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 she discipline? must we discipline? must you discipline? must they discipline?
V-ing form
must I be disciplining? must you be disciplining? must she be disciplining? must we be disciplining? must you be disciplining? must they be disciplining?
Perfect
must I have disciplined? must you have disciplined? must she 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 she 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 she 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 she 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 she 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 she have been disciplining? mustn't we have been disciplining? mustn't you have been disciplining? mustn't they have been disciplining?