must refit
Irregular verb: refit - refit- refit

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must refit
you must refit
he must refit
we must refit
you must refit
they must refit 	I must be refitting
you must be refitting
he must be refitting
we must be refitting
you must be refitting
they must be refitting	I must have refit
you must have refit
he must have refit
we must have refit
you must have refit
they must have refit	I must have been refitting
you must have been refitting
he must have been refitting
we must have been refitting
you must have been refitting
they must have been refitting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't refit
you mustn't refit
he mustn't refit
we mustn't refit
you mustn't refit
they mustn't refit 	I mustn't be refitting
you mustn't be refitting
he mustn't be refitting
we mustn't be refitting
you mustn't be refitting
they mustn't be refitting	I mustn't have refit
you mustn't have refit
he mustn't have refit
we mustn't have refit
you mustn't have refit
they mustn't have refit	I mustn't have been refitting
you mustn't have been refitting
he mustn't have been refitting
we mustn't have been refitting
you mustn't have been refitting
they mustn't have been refitting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I refit?
must you refit?
must he refit?
must we refit?
must you refit?
must they refit? 	must I be refitting?
must you be refitting?
must he be refitting?
must we be refitting?
must you be refitting?
must they be refitting? 	must I have refit?
must you have refit?
must he have refit?
must we have refit?
must you have refit?
must they have refit? 	must I have been refitting?
must you have been refitting?
must he have been refitting?
must we have been refitting?
must you have been refitting?
must they have been refitting? 	

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