must tango
Regular verb: tango - tangoed- tangoed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tango
you must tango
he must tango
we must tango
you must tango
they must tango 	I must be tangoing
you must be tangoing
he must be tangoing
we must be tangoing
you must be tangoing
they must be tangoing	I must have tangoed
you must have tangoed
he must have tangoed
we must have tangoed
you must have tangoed
they must have tangoed	I must have been tangoing
you must have been tangoing
he must have been tangoing
we must have been tangoing
you must have been tangoing
they must have been tangoing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tango
you mustn't tango
he mustn't tango
we mustn't tango
you mustn't tango
they mustn't tango 	I mustn't be tangoing
you mustn't be tangoing
he mustn't be tangoing
we mustn't be tangoing
you mustn't be tangoing
they mustn't be tangoing	I mustn't have tangoed
you mustn't have tangoed
he mustn't have tangoed
we mustn't have tangoed
you mustn't have tangoed
they mustn't have tangoed	I mustn't have been tangoing
you mustn't have been tangoing
he mustn't have been tangoing
we mustn't have been tangoing
you mustn't have been tangoing
they mustn't have been tangoing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tango?
must you tango?
must he tango?
must we tango?
must you tango?
must they tango? 	must I be tangoing?
must you be tangoing?
must he be tangoing?
must we be tangoing?
must you be tangoing?
must they be tangoing? 	must I have tangoed?
must you have tangoed?
must he have tangoed?
must we have tangoed?
must you have tangoed?
must they have tangoed? 	must I have been tangoing?
must you have been tangoing?
must he have been tangoing?
must we have been tangoing?
must you have been tangoing?
must they have been tangoing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tango?
mustn't you tango?
mustn't he tango?
mustn't we tango?
mustn't you tango?
mustn't they tango? 	mustn't I be tangoing?
mustn't you be tangoing?
mustn't he be tangoing?
mustn't we be tangoing?
mustn't you be tangoing?
mustn't they be tangoing? 	mustn't I have tangoed?
mustn't you have tangoed?
mustn't he have tangoed?
mustn't we have tangoed?
mustn't you have tangoed?
mustn't they have tangoed? 	mustn't I have been tangoing?
mustn't you have been tangoing?
mustn't he have been tangoing?
mustn't we have been tangoing?
mustn't you have been tangoing?
mustn't they have been tangoing?