must retire
Regular verb: retire - retired- retired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must retire
you must retire
he must retire
we must retire
you must retire
they must retire 	I must be retiring
you must be retiring
he must be retiring
we must be retiring
you must be retiring
they must be retiring	I must have retired
you must have retired
he must have retired
we must have retired
you must have retired
they must have retired	I must have been retiring
you must have been retiring
he must have been retiring
we must have been retiring
you must have been retiring
they must have been retiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't retire
you mustn't retire
he mustn't retire
we mustn't retire
you mustn't retire
they mustn't retire 	I mustn't be retiring
you mustn't be retiring
he mustn't be retiring
we mustn't be retiring
you mustn't be retiring
they mustn't be retiring	I mustn't have retired
you mustn't have retired
he mustn't have retired
we mustn't have retired
you mustn't have retired
they mustn't have retired	I mustn't have been retiring
you mustn't have been retiring
he mustn't have been retiring
we mustn't have been retiring
you mustn't have been retiring
they mustn't have been retiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I retire?
must you retire?
must he retire?
must we retire?
must you retire?
must they retire? 	must I be retiring?
must you be retiring?
must he be retiring?
must we be retiring?
must you be retiring?
must they be retiring? 	must I have retired?
must you have retired?
must he have retired?
must we have retired?
must you have retired?
must they have retired? 	must I have been retiring?
must you have been retiring?
must he have been retiring?
must we have been retiring?
must you have been retiring?
must they have been retiring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I retire?
mustn't you retire?
mustn't he retire?
mustn't we retire?
mustn't you retire?
mustn't they retire? 	mustn't I be retiring?
mustn't you be retiring?
mustn't he be retiring?
mustn't we be retiring?
mustn't you be retiring?
mustn't they be retiring? 	mustn't I have retired?
mustn't you have retired?
mustn't he have retired?
mustn't we have retired?
mustn't you have retired?
mustn't they have retired? 	mustn't I have been retiring?
mustn't you have been retiring?
mustn't he have been retiring?
mustn't we have been retiring?
mustn't you have been retiring?
mustn't they have been retiring?