must wassail
Regular verb: wassail - wassailed- wassailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must wassail
you must wassail
she must wassail
we must wassail
you must wassail
they must wassail 	I must be wassailing
you must be wassailing
she must be wassailing
we must be wassailing
you must be wassailing
they must be wassailing	I must have wassailed
you must have wassailed
she must have wassailed
we must have wassailed
you must have wassailed
they must have wassailed	I must have been wassailing
you must have been wassailing
she must have been wassailing
we must have been wassailing
you must have been wassailing
they must have been wassailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't wassail
you mustn't wassail
she mustn't wassail
we mustn't wassail
you mustn't wassail
they mustn't wassail 	I mustn't be wassailing
you mustn't be wassailing
she mustn't be wassailing
we mustn't be wassailing
you mustn't be wassailing
they mustn't be wassailing	I mustn't have wassailed
you mustn't have wassailed
she mustn't have wassailed
we mustn't have wassailed
you mustn't have wassailed
they mustn't have wassailed	I mustn't have been wassailing
you mustn't have been wassailing
she mustn't have been wassailing
we mustn't have been wassailing
you mustn't have been wassailing
they mustn't have been wassailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I wassail?
must you wassail?
must she wassail?
must we wassail?
must you wassail?
must they wassail? 	must I be wassailing?
must you be wassailing?
must she be wassailing?
must we be wassailing?
must you be wassailing?
must they be wassailing? 	must I have wassailed?
must you have wassailed?
must she have wassailed?
must we have wassailed?
must you have wassailed?
must they have wassailed? 	must I have been wassailing?
must you have been wassailing?
must she have been wassailing?
must we have been wassailing?
must you have been wassailing?
must they have been wassailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I wassail?
mustn't you wassail?
mustn't she wassail?
mustn't we wassail?
mustn't you wassail?
mustn't they wassail? 	mustn't I be wassailing?
mustn't you be wassailing?
mustn't she be wassailing?
mustn't we be wassailing?
mustn't you be wassailing?
mustn't they be wassailing? 	mustn't I have wassailed?
mustn't you have wassailed?
mustn't she have wassailed?
mustn't we have wassailed?
mustn't you have wassailed?
mustn't they have wassailed? 	mustn't I have been wassailing?
mustn't you have been wassailing?
mustn't she have been wassailing?
mustn't we have been wassailing?
mustn't you have been wassailing?
mustn't they have been wassailing?