must sober
Regular verb: sober - sobered- sobered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sober
you must sober
she must sober
we must sober
you must sober
they must sober 	I must be sobering
you must be sobering
she must be sobering
we must be sobering
you must be sobering
they must be sobering	I must have sobered
you must have sobered
she must have sobered
we must have sobered
you must have sobered
they must have sobered	I must have been sobering
you must have been sobering
she must have been sobering
we must have been sobering
you must have been sobering
they must have been sobering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sober
you mustn't sober
she mustn't sober
we mustn't sober
you mustn't sober
they mustn't sober 	I mustn't be sobering
you mustn't be sobering
she mustn't be sobering
we mustn't be sobering
you mustn't be sobering
they mustn't be sobering	I mustn't have sobered
you mustn't have sobered
she mustn't have sobered
we mustn't have sobered
you mustn't have sobered
they mustn't have sobered	I mustn't have been sobering
you mustn't have been sobering
she mustn't have been sobering
we mustn't have been sobering
you mustn't have been sobering
they mustn't have been sobering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sober?
must you sober?
must she sober?
must we sober?
must you sober?
must they sober? 	must I be sobering?
must you be sobering?
must she be sobering?
must we be sobering?
must you be sobering?
must they be sobering? 	must I have sobered?
must you have sobered?
must she have sobered?
must we have sobered?
must you have sobered?
must they have sobered? 	must I have been sobering?
must you have been sobering?
must she have been sobering?
must we have been sobering?
must you have been sobering?
must they have been sobering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sober?
mustn't you sober?
mustn't she sober?
mustn't we sober?
mustn't you sober?
mustn't they sober? 	mustn't I be sobering?
mustn't you be sobering?
mustn't she be sobering?
mustn't we be sobering?
mustn't you be sobering?
mustn't they be sobering? 	mustn't I have sobered?
mustn't you have sobered?
mustn't she have sobered?
mustn't we have sobered?
mustn't you have sobered?
mustn't they have sobered? 	mustn't I have been sobering?
mustn't you have been sobering?
mustn't she have been sobering?
mustn't we have been sobering?
mustn't you have been sobering?
mustn't they have been sobering?