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