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 must not sober
you must not sober
she must not sober
we must not sober
you must not sober
they must not sober 	I must not be sobering
you must not be sobering
she must not be sobering
we must not be sobering
you must not be sobering
they must not be sobering	I must not have sobered
you must not have sobered
she must not have sobered
we must not have sobered
you must not have sobered
they must not have sobered	I must not have been sobering
you must not have been sobering
she must not have been sobering
we must not have been sobering
you must not have been sobering
they must not 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 	
must I not sober?
must you not sober?
must she not sober?
must we not sober?
must you not sober?
must they not sober? 	must I not be sobering?
must you not be sobering?
must she not be sobering?
must we not be sobering?
must you not be sobering?
must they not be sobering? 	must I not have sobered?
must you not have sobered?
must she not have sobered?
must we not have sobered?
must you not have sobered?
must they not have sobered? 	must I not have been sobering?
must you not have been sobering?
must she not have been sobering?
must we not have been sobering?
must you not have been sobering?
must they not have been sobering?