must vail
Regular verb: vail - vailed- vailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vail
you must vail
she must vail
we must vail
you must vail
they must vail 	I must be vailing
you must be vailing
she must be vailing
we must be vailing
you must be vailing
they must be vailing	I must have vailed
you must have vailed
she must have vailed
we must have vailed
you must have vailed
they must have vailed	I must have been vailing
you must have been vailing
she must have been vailing
we must have been vailing
you must have been vailing
they must have been vailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vail
you mustn't vail
she mustn't vail
we mustn't vail
you mustn't vail
they mustn't vail 	I mustn't be vailing
you mustn't be vailing
she mustn't be vailing
we mustn't be vailing
you mustn't be vailing
they mustn't be vailing	I mustn't have vailed
you mustn't have vailed
she mustn't have vailed
we mustn't have vailed
you mustn't have vailed
they mustn't have vailed	I mustn't have been vailing
you mustn't have been vailing
she mustn't have been vailing
we mustn't have been vailing
you mustn't have been vailing
they mustn't have been vailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vail?
must you vail?
must she vail?
must we vail?
must you vail?
must they vail? 	must I be vailing?
must you be vailing?
must she be vailing?
must we be vailing?
must you be vailing?
must they be vailing? 	must I have vailed?
must you have vailed?
must she have vailed?
must we have vailed?
must you have vailed?
must they have vailed? 	must I have been vailing?
must you have been vailing?
must she have been vailing?
must we have been vailing?
must you have been vailing?
must they have been vailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I vail?
mustn't you vail?
mustn't she vail?
mustn't we vail?
mustn't you vail?
mustn't they vail? 	mustn't I be vailing?
mustn't you be vailing?
mustn't she be vailing?
mustn't we be vailing?
mustn't you be vailing?
mustn't they be vailing? 	mustn't I have vailed?
mustn't you have vailed?
mustn't she have vailed?
mustn't we have vailed?
mustn't you have vailed?
mustn't they have vailed? 	mustn't I have been vailing?
mustn't you have been vailing?
mustn't she have been vailing?
mustn't we have been vailing?
mustn't you have been vailing?
mustn't they have been vailing?