must sleep
Irregular verb: sleep - slept- slept

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sleep
you must sleep
she must sleep
we must sleep
you must sleep
they must sleep 	I must be sleeping
you must be sleeping
she must be sleeping
we must be sleeping
you must be sleeping
they must be sleeping	I must have slept
you must have slept
she must have slept
we must have slept
you must have slept
they must have slept	I must have been sleeping
you must have been sleeping
she must have been sleeping
we must have been sleeping
you must have been sleeping
they must have been sleeping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sleep
you mustn't sleep
she mustn't sleep
we mustn't sleep
you mustn't sleep
they mustn't sleep 	I mustn't be sleeping
you mustn't be sleeping
she mustn't be sleeping
we mustn't be sleeping
you mustn't be sleeping
they mustn't be sleeping	I mustn't have slept
you mustn't have slept
she mustn't have slept
we mustn't have slept
you mustn't have slept
they mustn't have slept	I mustn't have been sleeping
you mustn't have been sleeping
she mustn't have been sleeping
we mustn't have been sleeping
you mustn't have been sleeping
they mustn't have been sleeping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sleep?
must you sleep?
must she sleep?
must we sleep?
must you sleep?
must they sleep? 	must I be sleeping?
must you be sleeping?
must she be sleeping?
must we be sleeping?
must you be sleeping?
must they be sleeping? 	must I have slept?
must you have slept?
must she have slept?
must we have slept?
must you have slept?
must they have slept? 	must I have been sleeping?
must you have been sleeping?
must she have been sleeping?
must we have been sleeping?
must you have been sleeping?
must they have been sleeping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sleep?
mustn't you sleep?
mustn't she sleep?
mustn't we sleep?
mustn't you sleep?
mustn't they sleep? 	mustn't I be sleeping?
mustn't you be sleeping?
mustn't she be sleeping?
mustn't we be sleeping?
mustn't you be sleeping?
mustn't they be sleeping? 	mustn't I have slept?
mustn't you have slept?
mustn't she have slept?
mustn't we have slept?
mustn't you have slept?
mustn't they have slept? 	mustn't I have been sleeping?
mustn't you have been sleeping?
mustn't she have been sleeping?
mustn't we have been sleeping?
mustn't you have been sleeping?
mustn't they have been sleeping?