must limber
Regular verb: limber - limbered- limbered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must limber
you must limber
he must limber
we must limber
you must limber
they must limber 	I must be limbering
you must be limbering
he must be limbering
we must be limbering
you must be limbering
they must be limbering	I must have limbered
you must have limbered
he must have limbered
we must have limbered
you must have limbered
they must have limbered	I must have been limbering
you must have been limbering
he must have been limbering
we must have been limbering
you must have been limbering
they must have been limbering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't limber
you mustn't limber
he mustn't limber
we mustn't limber
you mustn't limber
they mustn't limber 	I mustn't be limbering
you mustn't be limbering
he mustn't be limbering
we mustn't be limbering
you mustn't be limbering
they mustn't be limbering	I mustn't have limbered
you mustn't have limbered
he mustn't have limbered
we mustn't have limbered
you mustn't have limbered
they mustn't have limbered	I mustn't have been limbering
you mustn't have been limbering
he mustn't have been limbering
we mustn't have been limbering
you mustn't have been limbering
they mustn't have been limbering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I limber?
must you limber?
must he limber?
must we limber?
must you limber?
must they limber? 	must I be limbering?
must you be limbering?
must he be limbering?
must we be limbering?
must you be limbering?
must they be limbering? 	must I have limbered?
must you have limbered?
must he have limbered?
must we have limbered?
must you have limbered?
must they have limbered? 	must I have been limbering?
must you have been limbering?
must he have been limbering?
must we have been limbering?
must you have been limbering?
must they have been limbering? 	

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