must counterquestion
Regular verb: counterquestion - counterquestioned- counterquestioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must counterquestion
you must counterquestion
he must counterquestion
we must counterquestion
you must counterquestion
they must counterquestion 	I must be counterquestioning
you must be counterquestioning
he must be counterquestioning
we must be counterquestioning
you must be counterquestioning
they must be counterquestioning	I must have counterquestioned
you must have counterquestioned
he must have counterquestioned
we must have counterquestioned
you must have counterquestioned
they must have counterquestioned	I must have been counterquestioning
you must have been counterquestioning
he must have been counterquestioning
we must have been counterquestioning
you must have been counterquestioning
they must have been counterquestioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't counterquestion
you mustn't counterquestion
he mustn't counterquestion
we mustn't counterquestion
you mustn't counterquestion
they mustn't counterquestion 	I mustn't be counterquestioning
you mustn't be counterquestioning
he mustn't be counterquestioning
we mustn't be counterquestioning
you mustn't be counterquestioning
they mustn't be counterquestioning	I mustn't have counterquestioned
you mustn't have counterquestioned
he mustn't have counterquestioned
we mustn't have counterquestioned
you mustn't have counterquestioned
they mustn't have counterquestioned	I mustn't have been counterquestioning
you mustn't have been counterquestioning
he mustn't have been counterquestioning
we mustn't have been counterquestioning
you mustn't have been counterquestioning
they mustn't have been counterquestioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I counterquestion?
must you counterquestion?
must he counterquestion?
must we counterquestion?
must you counterquestion?
must they counterquestion? 	must I be counterquestioning?
must you be counterquestioning?
must he be counterquestioning?
must we be counterquestioning?
must you be counterquestioning?
must they be counterquestioning? 	must I have counterquestioned?
must you have counterquestioned?
must he have counterquestioned?
must we have counterquestioned?
must you have counterquestioned?
must they have counterquestioned? 	must I have been counterquestioning?
must you have been counterquestioning?
must he have been counterquestioning?
must we have been counterquestioning?
must you have been counterquestioning?
must they have been counterquestioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I counterquestion?
mustn't you counterquestion?
mustn't he counterquestion?
mustn't we counterquestion?
mustn't you counterquestion?
mustn't they counterquestion? 	mustn't I be counterquestioning?
mustn't you be counterquestioning?
mustn't he be counterquestioning?
mustn't we be counterquestioning?
mustn't you be counterquestioning?
mustn't they be counterquestioning? 	mustn't I have counterquestioned?
mustn't you have counterquestioned?
mustn't he have counterquestioned?
mustn't we have counterquestioned?
mustn't you have counterquestioned?
mustn't they have counterquestioned? 	mustn't I have been counterquestioning?
mustn't you have been counterquestioning?
mustn't he have been counterquestioning?
mustn't we have been counterquestioning?
mustn't you have been counterquestioning?
mustn't they have been counterquestioning?