must skate
Regular verb: skate - skated- skated

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't skate
you mustn't skate
she mustn't skate
we mustn't skate
you mustn't skate
they mustn't skate 	I mustn't be skating
you mustn't be skating
she mustn't be skating
we mustn't be skating
you mustn't be skating
they mustn't be skating	I mustn't have skated
you mustn't have skated
she mustn't have skated
we mustn't have skated
you mustn't have skated
they mustn't have skated	I mustn't have been skating
you mustn't have been skating
she mustn't have been skating
we mustn't have been skating
you mustn't have been skating
they mustn't have been skating	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I skate?
mustn't you skate?
mustn't she skate?
mustn't we skate?
mustn't you skate?
mustn't they skate? 	mustn't I be skating?
mustn't you be skating?
mustn't she be skating?
mustn't we be skating?
mustn't you be skating?
mustn't they be skating? 	mustn't I have skated?
mustn't you have skated?
mustn't she have skated?
mustn't we have skated?
mustn't you have skated?
mustn't they have skated? 	mustn't I have been skating?
mustn't you have been skating?
mustn't she have been skating?
mustn't we have been skating?
mustn't you have been skating?
mustn't they have been skating?