I must suit you must suit she must suit we must suit you must suit they must suit
V-ing form
I must be suiting you must be suiting she must be suiting we must be suiting you must be suiting they must be suiting
Perfect
I must have suited you must have suited she must have suited we must have suited you must have suited they must have suited
V-ing perfect
I must have been suiting you must have been suiting she must have been suiting we must have been suiting you must have been suiting they must have been suiting
Negation
Simple form
I mustn't suit you mustn't suit she mustn't suit we mustn't suit you mustn't suit they mustn't suit
V-ing form
I mustn't be suiting you mustn't be suiting she mustn't be suiting we mustn't be suiting you mustn't be suiting they mustn't be suiting
Perfect
I mustn't have suited you mustn't have suited she mustn't have suited we mustn't have suited you mustn't have suited they mustn't have suited
V-ing perfect
I mustn't have been suiting you mustn't have been suiting she mustn't have been suiting we mustn't have been suiting you mustn't have been suiting they mustn't have been suiting
Interrogative form
Simple form
must I suit? must you suit? must she suit? must we suit? must you suit? must they suit?
V-ing form
must I be suiting? must you be suiting? must she be suiting? must we be suiting? must you be suiting? must they be suiting?
Perfect
must I have suited? must you have suited? must she have suited? must we have suited? must you have suited? must they have suited?
V-ing perfect
must I have been suiting? must you have been suiting? must she have been suiting? must we have been suiting? must you have been suiting? must they have been suiting?
Interro-negative form
Simple form
mustn't I suit? mustn't you suit? mustn't she suit? mustn't we suit? mustn't you suit? mustn't they suit?
V-ing form
mustn't I be suiting? mustn't you be suiting? mustn't she be suiting? mustn't we be suiting? mustn't you be suiting? mustn't they be suiting?
Perfect
mustn't I have suited? mustn't you have suited? mustn't she have suited? mustn't we have suited? mustn't you have suited? mustn't they have suited?
V-ing perfect
mustn't I have been suiting? mustn't you have been suiting? mustn't she have been suiting? mustn't we have been suiting? mustn't you have been suiting? mustn't they have been suiting?