must singularize
Regular verb: singularize - singularized- singularized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must singularize
you must singularize
he must singularize
we must singularize
you must singularize
they must singularize 	I must be singularizing
you must be singularizing
he must be singularizing
we must be singularizing
you must be singularizing
they must be singularizing	I must have singularized
you must have singularized
he must have singularized
we must have singularized
you must have singularized
they must have singularized	I must have been singularizing
you must have been singularizing
he must have been singularizing
we must have been singularizing
you must have been singularizing
they must have been singularizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't singularize
you mustn't singularize
he mustn't singularize
we mustn't singularize
you mustn't singularize
they mustn't singularize 	I mustn't be singularizing
you mustn't be singularizing
he mustn't be singularizing
we mustn't be singularizing
you mustn't be singularizing
they mustn't be singularizing	I mustn't have singularized
you mustn't have singularized
he mustn't have singularized
we mustn't have singularized
you mustn't have singularized
they mustn't have singularized	I mustn't have been singularizing
you mustn't have been singularizing
he mustn't have been singularizing
we mustn't have been singularizing
you mustn't have been singularizing
they mustn't have been singularizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I singularize?
must you singularize?
must he singularize?
must we singularize?
must you singularize?
must they singularize? 	must I be singularizing?
must you be singularizing?
must he be singularizing?
must we be singularizing?
must you be singularizing?
must they be singularizing? 	must I have singularized?
must you have singularized?
must he have singularized?
must we have singularized?
must you have singularized?
must they have singularized? 	must I have been singularizing?
must you have been singularizing?
must he have been singularizing?
must we have been singularizing?
must you have been singularizing?
must they have been singularizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I singularize?
mustn't you singularize?
mustn't he singularize?
mustn't we singularize?
mustn't you singularize?
mustn't they singularize? 	mustn't I be singularizing?
mustn't you be singularizing?
mustn't he be singularizing?
mustn't we be singularizing?
mustn't you be singularizing?
mustn't they be singularizing? 	mustn't I have singularized?
mustn't you have singularized?
mustn't he have singularized?
mustn't we have singularized?
mustn't you have singularized?
mustn't they have singularized? 	mustn't I have been singularizing?
mustn't you have been singularizing?
mustn't he have been singularizing?
mustn't we have been singularizing?
mustn't you have been singularizing?
mustn't they have been singularizing?