must cram
Regular verb: cram - crammed- crammed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cram
you must cram
he must cram
we must cram
you must cram
they must cram 	I must be cramming
you must be cramming
he must be cramming
we must be cramming
you must be cramming
they must be cramming	I must have crammed
you must have crammed
he must have crammed
we must have crammed
you must have crammed
they must have crammed	I must have been cramming
you must have been cramming
he must have been cramming
we must have been cramming
you must have been cramming
they must have been cramming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't cram
you mustn't cram
he mustn't cram
we mustn't cram
you mustn't cram
they mustn't cram 	I mustn't be cramming
you mustn't be cramming
he mustn't be cramming
we mustn't be cramming
you mustn't be cramming
they mustn't be cramming	I mustn't have crammed
you mustn't have crammed
he mustn't have crammed
we mustn't have crammed
you mustn't have crammed
they mustn't have crammed	I mustn't have been cramming
you mustn't have been cramming
he mustn't have been cramming
we mustn't have been cramming
you mustn't have been cramming
they mustn't have been cramming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cram?
must you cram?
must he cram?
must we cram?
must you cram?
must they cram? 	must I be cramming?
must you be cramming?
must he be cramming?
must we be cramming?
must you be cramming?
must they be cramming? 	must I have crammed?
must you have crammed?
must he have crammed?
must we have crammed?
must you have crammed?
must they have crammed? 	must I have been cramming?
must you have been cramming?
must he have been cramming?
must we have been cramming?
must you have been cramming?
must they have been cramming? 	

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