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