must culm
Regular verb: culm - culmed- culmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must culm
you must culm
he must culm
we must culm
you must culm
they must culm 	I must be culming
you must be culming
he must be culming
we must be culming
you must be culming
they must be culming	I must have culmed
you must have culmed
he must have culmed
we must have culmed
you must have culmed
they must have culmed	I must have been culming
you must have been culming
he must have been culming
we must have been culming
you must have been culming
they must have been culming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't culm
you mustn't culm
he mustn't culm
we mustn't culm
you mustn't culm
they mustn't culm 	I mustn't be culming
you mustn't be culming
he mustn't be culming
we mustn't be culming
you mustn't be culming
they mustn't be culming	I mustn't have culmed
you mustn't have culmed
he mustn't have culmed
we mustn't have culmed
you mustn't have culmed
they mustn't have culmed	I mustn't have been culming
you mustn't have been culming
he mustn't have been culming
we mustn't have been culming
you mustn't have been culming
they mustn't have been culming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I culm?
must you culm?
must he culm?
must we culm?
must you culm?
must they culm? 	must I be culming?
must you be culming?
must he be culming?
must we be culming?
must you be culming?
must they be culming? 	must I have culmed?
must you have culmed?
must he have culmed?
must we have culmed?
must you have culmed?
must they have culmed? 	must I have been culming?
must you have been culming?
must he have been culming?
must we have been culming?
must you have been culming?
must they have been culming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I culm?
mustn't you culm?
mustn't he culm?
mustn't we culm?
mustn't you culm?
mustn't they culm? 	mustn't I be culming?
mustn't you be culming?
mustn't he be culming?
mustn't we be culming?
mustn't you be culming?
mustn't they be culming? 	mustn't I have culmed?
mustn't you have culmed?
mustn't he have culmed?
mustn't we have culmed?
mustn't you have culmed?
mustn't they have culmed? 	mustn't I have been culming?
mustn't you have been culming?
mustn't he have been culming?
mustn't we have been culming?
mustn't you have been culming?
mustn't they have been culming?