must question
Regular verb: question - questioned- questioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must question
you must question
she must question
we must question
you must question
they must question 	I must be questioning
you must be questioning
she must be questioning
we must be questioning
you must be questioning
they must be questioning	I must have questioned
you must have questioned
she must have questioned
we must have questioned
you must have questioned
they must have questioned	I must have been questioning
you must have been questioning
she must have been questioning
we must have been questioning
you must have been questioning
they must have been questioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't question
you mustn't question
she mustn't question
we mustn't question
you mustn't question
they mustn't question 	I mustn't be questioning
you mustn't be questioning
she mustn't be questioning
we mustn't be questioning
you mustn't be questioning
they mustn't be questioning	I mustn't have questioned
you mustn't have questioned
she mustn't have questioned
we mustn't have questioned
you mustn't have questioned
they mustn't have questioned	I mustn't have been questioning
you mustn't have been questioning
she mustn't have been questioning
we mustn't have been questioning
you mustn't have been questioning
they mustn't have been questioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I question?
must you question?
must she question?
must we question?
must you question?
must they question? 	must I be questioning?
must you be questioning?
must she be questioning?
must we be questioning?
must you be questioning?
must they be questioning? 	must I have questioned?
must you have questioned?
must she have questioned?
must we have questioned?
must you have questioned?
must they have questioned? 	must I have been questioning?
must you have been questioning?
must she have been questioning?
must we have been questioning?
must you have been questioning?
must they have been questioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I question?
mustn't you question?
mustn't she question?
mustn't we question?
mustn't you question?
mustn't they question? 	mustn't I be questioning?
mustn't you be questioning?
mustn't she be questioning?
mustn't we be questioning?
mustn't you be questioning?
mustn't they be questioning? 	mustn't I have questioned?
mustn't you have questioned?
mustn't she have questioned?
mustn't we have questioned?
mustn't you have questioned?
mustn't they have questioned? 	mustn't I have been questioning?
mustn't you have been questioning?
mustn't she have been questioning?
mustn't we have been questioning?
mustn't you have been questioning?
mustn't they have been questioning?