must gang
Regular verb: gang - ganged- ganged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gang
you must gang
he must gang
we must gang
you must gang
they must gang 	I must be ganging
you must be ganging
he must be ganging
we must be ganging
you must be ganging
they must be ganging	I must have ganged
you must have ganged
he must have ganged
we must have ganged
you must have ganged
they must have ganged	I must have been ganging
you must have been ganging
he must have been ganging
we must have been ganging
you must have been ganging
they must have been ganging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gang
you mustn't gang
he mustn't gang
we mustn't gang
you mustn't gang
they mustn't gang 	I mustn't be ganging
you mustn't be ganging
he mustn't be ganging
we mustn't be ganging
you mustn't be ganging
they mustn't be ganging	I mustn't have ganged
you mustn't have ganged
he mustn't have ganged
we mustn't have ganged
you mustn't have ganged
they mustn't have ganged	I mustn't have been ganging
you mustn't have been ganging
he mustn't have been ganging
we mustn't have been ganging
you mustn't have been ganging
they mustn't have been ganging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gang?
must you gang?
must he gang?
must we gang?
must you gang?
must they gang? 	must I be ganging?
must you be ganging?
must he be ganging?
must we be ganging?
must you be ganging?
must they be ganging? 	must I have ganged?
must you have ganged?
must he have ganged?
must we have ganged?
must you have ganged?
must they have ganged? 	must I have been ganging?
must you have been ganging?
must he have been ganging?
must we have been ganging?
must you have been ganging?
must they have been ganging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gang?
mustn't you gang?
mustn't he gang?
mustn't we gang?
mustn't you gang?
mustn't they gang? 	mustn't I be ganging?
mustn't you be ganging?
mustn't he be ganging?
mustn't we be ganging?
mustn't you be ganging?
mustn't they be ganging? 	mustn't I have ganged?
mustn't you have ganged?
mustn't he have ganged?
mustn't we have ganged?
mustn't you have ganged?
mustn't they have ganged? 	mustn't I have been ganging?
mustn't you have been ganging?
mustn't he have been ganging?
mustn't we have been ganging?
mustn't you have been ganging?
mustn't they have been ganging?