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