must snowboard
Regular verb: snowboard - snowboarded- snowboarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must snowboard
you must snowboard
she must snowboard
we must snowboard
you must snowboard
they must snowboard 	I must be snowboarding
you must be snowboarding
she must be snowboarding
we must be snowboarding
you must be snowboarding
they must be snowboarding	I must have snowboarded
you must have snowboarded
she must have snowboarded
we must have snowboarded
you must have snowboarded
they must have snowboarded	I must have been snowboarding
you must have been snowboarding
she must have been snowboarding
we must have been snowboarding
you must have been snowboarding
they must have been snowboarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not snowboard
you must not snowboard
she must not snowboard
we must not snowboard
you must not snowboard
they must not snowboard 	I must not be snowboarding
you must not be snowboarding
she must not be snowboarding
we must not be snowboarding
you must not be snowboarding
they must not be snowboarding	I must not have snowboarded
you must not have snowboarded
she must not have snowboarded
we must not have snowboarded
you must not have snowboarded
they must not have snowboarded	I must not have been snowboarding
you must not have been snowboarding
she must not have been snowboarding
we must not have been snowboarding
you must not have been snowboarding
they must not have been snowboarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I snowboard?
must you snowboard?
must she snowboard?
must we snowboard?
must you snowboard?
must they snowboard? 	must I be snowboarding?
must you be snowboarding?
must she be snowboarding?
must we be snowboarding?
must you be snowboarding?
must they be snowboarding? 	must I have snowboarded?
must you have snowboarded?
must she have snowboarded?
must we have snowboarded?
must you have snowboarded?
must they have snowboarded? 	must I have been snowboarding?
must you have been snowboarding?
must she have been snowboarding?
must we have been snowboarding?
must you have been snowboarding?
must they have been snowboarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not snowboard?
must you not snowboard?
must she not snowboard?
must we not snowboard?
must you not snowboard?
must they not snowboard? 	must I not be snowboarding?
must you not be snowboarding?
must she not be snowboarding?
must we not be snowboarding?
must you not be snowboarding?
must they not be snowboarding? 	must I not have snowboarded?
must you not have snowboarded?
must she not have snowboarded?
must we not have snowboarded?
must you not have snowboarded?
must they not have snowboarded? 	must I not have been snowboarding?
must you not have been snowboarding?
must she not have been snowboarding?
must we not have been snowboarding?
must you not have been snowboarding?
must they not have been snowboarding?