must retrace
Regular verb: retrace - retraced- retraced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must retrace
you must retrace
he must retrace
we must retrace
you must retrace
they must retrace 	I must be retracing
you must be retracing
he must be retracing
we must be retracing
you must be retracing
they must be retracing	I must have retraced
you must have retraced
he must have retraced
we must have retraced
you must have retraced
they must have retraced	I must have been retracing
you must have been retracing
he must have been retracing
we must have been retracing
you must have been retracing
they must have been retracing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't retrace
you mustn't retrace
he mustn't retrace
we mustn't retrace
you mustn't retrace
they mustn't retrace 	I mustn't be retracing
you mustn't be retracing
he mustn't be retracing
we mustn't be retracing
you mustn't be retracing
they mustn't be retracing	I mustn't have retraced
you mustn't have retraced
he mustn't have retraced
we mustn't have retraced
you mustn't have retraced
they mustn't have retraced	I mustn't have been retracing
you mustn't have been retracing
he mustn't have been retracing
we mustn't have been retracing
you mustn't have been retracing
they mustn't have been retracing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I retrace?
must you retrace?
must he retrace?
must we retrace?
must you retrace?
must they retrace? 	must I be retracing?
must you be retracing?
must he be retracing?
must we be retracing?
must you be retracing?
must they be retracing? 	must I have retraced?
must you have retraced?
must he have retraced?
must we have retraced?
must you have retraced?
must they have retraced? 	must I have been retracing?
must you have been retracing?
must he have been retracing?
must we have been retracing?
must you have been retracing?
must they have been retracing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I retrace?
mustn't you retrace?
mustn't he retrace?
mustn't we retrace?
mustn't you retrace?
mustn't they retrace? 	mustn't I be retracing?
mustn't you be retracing?
mustn't he be retracing?
mustn't we be retracing?
mustn't you be retracing?
mustn't they be retracing? 	mustn't I have retraced?
mustn't you have retraced?
mustn't he have retraced?
mustn't we have retraced?
mustn't you have retraced?
mustn't they have retraced? 	mustn't I have been retracing?
mustn't you have been retracing?
mustn't he have been retracing?
mustn't we have been retracing?
mustn't you have been retracing?
mustn't they have been retracing?