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