must skirt
Regular verb: skirt - skirted- skirted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must skirt
you must skirt
he must skirt
we must skirt
you must skirt
they must skirt 	I must be skirting
you must be skirting
he must be skirting
we must be skirting
you must be skirting
they must be skirting	I must have skirted
you must have skirted
he must have skirted
we must have skirted
you must have skirted
they must have skirted	I must have been skirting
you must have been skirting
he must have been skirting
we must have been skirting
you must have been skirting
they must have been skirting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't skirt
you mustn't skirt
he mustn't skirt
we mustn't skirt
you mustn't skirt
they mustn't skirt 	I mustn't be skirting
you mustn't be skirting
he mustn't be skirting
we mustn't be skirting
you mustn't be skirting
they mustn't be skirting	I mustn't have skirted
you mustn't have skirted
he mustn't have skirted
we mustn't have skirted
you mustn't have skirted
they mustn't have skirted	I mustn't have been skirting
you mustn't have been skirting
he mustn't have been skirting
we mustn't have been skirting
you mustn't have been skirting
they mustn't have been skirting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I skirt?
must you skirt?
must he skirt?
must we skirt?
must you skirt?
must they skirt? 	must I be skirting?
must you be skirting?
must he be skirting?
must we be skirting?
must you be skirting?
must they be skirting? 	must I have skirted?
must you have skirted?
must he have skirted?
must we have skirted?
must you have skirted?
must they have skirted? 	must I have been skirting?
must you have been skirting?
must he have been skirting?
must we have been skirting?
must you have been skirting?
must they have been skirting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I skirt?
mustn't you skirt?
mustn't he skirt?
mustn't we skirt?
mustn't you skirt?
mustn't they skirt? 	mustn't I be skirting?
mustn't you be skirting?
mustn't he be skirting?
mustn't we be skirting?
mustn't you be skirting?
mustn't they be skirting? 	mustn't I have skirted?
mustn't you have skirted?
mustn't he have skirted?
mustn't we have skirted?
mustn't you have skirted?
mustn't they have skirted? 	mustn't I have been skirting?
mustn't you have been skirting?
mustn't he have been skirting?
mustn't we have been skirting?
mustn't you have been skirting?
mustn't they have been skirting?