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