must windsurf
Regular verb: windsurf - windsurfed- windsurfed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must windsurf
you must windsurf
she must windsurf
we must windsurf
you must windsurf
they must windsurf 	I must be windsurfing
you must be windsurfing
she must be windsurfing
we must be windsurfing
you must be windsurfing
they must be windsurfing	I must have windsurfed
you must have windsurfed
she must have windsurfed
we must have windsurfed
you must have windsurfed
they must have windsurfed	I must have been windsurfing
you must have been windsurfing
she must have been windsurfing
we must have been windsurfing
you must have been windsurfing
they must have been windsurfing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't windsurf
you mustn't windsurf
she mustn't windsurf
we mustn't windsurf
you mustn't windsurf
they mustn't windsurf 	I mustn't be windsurfing
you mustn't be windsurfing
she mustn't be windsurfing
we mustn't be windsurfing
you mustn't be windsurfing
they mustn't be windsurfing	I mustn't have windsurfed
you mustn't have windsurfed
she mustn't have windsurfed
we mustn't have windsurfed
you mustn't have windsurfed
they mustn't have windsurfed	I mustn't have been windsurfing
you mustn't have been windsurfing
she mustn't have been windsurfing
we mustn't have been windsurfing
you mustn't have been windsurfing
they mustn't have been windsurfing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I windsurf?
must you windsurf?
must she windsurf?
must we windsurf?
must you windsurf?
must they windsurf? 	must I be windsurfing?
must you be windsurfing?
must she be windsurfing?
must we be windsurfing?
must you be windsurfing?
must they be windsurfing? 	must I have windsurfed?
must you have windsurfed?
must she have windsurfed?
must we have windsurfed?
must you have windsurfed?
must they have windsurfed? 	must I have been windsurfing?
must you have been windsurfing?
must she have been windsurfing?
must we have been windsurfing?
must you have been windsurfing?
must they have been windsurfing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I windsurf?
mustn't you windsurf?
mustn't she windsurf?
mustn't we windsurf?
mustn't you windsurf?
mustn't they windsurf? 	mustn't I be windsurfing?
mustn't you be windsurfing?
mustn't she be windsurfing?
mustn't we be windsurfing?
mustn't you be windsurfing?
mustn't they be windsurfing? 	mustn't I have windsurfed?
mustn't you have windsurfed?
mustn't she have windsurfed?
mustn't we have windsurfed?
mustn't you have windsurfed?
mustn't they have windsurfed? 	mustn't I have been windsurfing?
mustn't you have been windsurfing?
mustn't she have been windsurfing?
mustn't we have been windsurfing?
mustn't you have been windsurfing?
mustn't they have been windsurfing?