must ice-skate
Regular verb: ice-skate - ice-skated- ice-skated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ice-skate
you must ice-skate
he must ice-skate
we must ice-skate
you must ice-skate
they must ice-skate 	I must be ice-skating
you must be ice-skating
he must be ice-skating
we must be ice-skating
you must be ice-skating
they must be ice-skating	I must have ice-skated
you must have ice-skated
he must have ice-skated
we must have ice-skated
you must have ice-skated
they must have ice-skated	I must have been ice-skating
you must have been ice-skating
he must have been ice-skating
we must have been ice-skating
you must have been ice-skating
they must have been ice-skating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not ice-skate
you must not ice-skate
he must not ice-skate
we must not ice-skate
you must not ice-skate
they must not ice-skate 	I must not be ice-skating
you must not be ice-skating
he must not be ice-skating
we must not be ice-skating
you must not be ice-skating
they must not be ice-skating	I must not have ice-skated
you must not have ice-skated
he must not have ice-skated
we must not have ice-skated
you must not have ice-skated
they must not have ice-skated	I must not have been ice-skating
you must not have been ice-skating
he must not have been ice-skating
we must not have been ice-skating
you must not have been ice-skating
they must not have been ice-skating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ice-skate?
must you ice-skate?
must he ice-skate?
must we ice-skate?
must you ice-skate?
must they ice-skate? 	must I be ice-skating?
must you be ice-skating?
must he be ice-skating?
must we be ice-skating?
must you be ice-skating?
must they be ice-skating? 	must I have ice-skated?
must you have ice-skated?
must he have ice-skated?
must we have ice-skated?
must you have ice-skated?
must they have ice-skated? 	must I have been ice-skating?
must you have been ice-skating?
must he have been ice-skating?
must we have been ice-skating?
must you have been ice-skating?
must they have been ice-skating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not ice-skate?
must you not ice-skate?
must he not ice-skate?
must we not ice-skate?
must you not ice-skate?
must they not ice-skate? 	must I not be ice-skating?
must you not be ice-skating?
must he not be ice-skating?
must we not be ice-skating?
must you not be ice-skating?
must they not be ice-skating? 	must I not have ice-skated?
must you not have ice-skated?
must he not have ice-skated?
must we not have ice-skated?
must you not have ice-skated?
must they not have ice-skated? 	must I not have been ice-skating?
must you not have been ice-skating?
must he not have been ice-skating?
must we not have been ice-skating?
must you not have been ice-skating?
must they not have been ice-skating?