must tail
Regular verb: tail - tailed- tailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tail
you must tail
she must tail
we must tail
you must tail
they must tail 	I must be tailing
you must be tailing
she must be tailing
we must be tailing
you must be tailing
they must be tailing	I must have tailed
you must have tailed
she must have tailed
we must have tailed
you must have tailed
they must have tailed	I must have been tailing
you must have been tailing
she must have been tailing
we must have been tailing
you must have been tailing
they must have been tailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tail
you mustn't tail
she mustn't tail
we mustn't tail
you mustn't tail
they mustn't tail 	I mustn't be tailing
you mustn't be tailing
she mustn't be tailing
we mustn't be tailing
you mustn't be tailing
they mustn't be tailing	I mustn't have tailed
you mustn't have tailed
she mustn't have tailed
we mustn't have tailed
you mustn't have tailed
they mustn't have tailed	I mustn't have been tailing
you mustn't have been tailing
she mustn't have been tailing
we mustn't have been tailing
you mustn't have been tailing
they mustn't have been tailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tail?
must you tail?
must she tail?
must we tail?
must you tail?
must they tail? 	must I be tailing?
must you be tailing?
must she be tailing?
must we be tailing?
must you be tailing?
must they be tailing? 	must I have tailed?
must you have tailed?
must she have tailed?
must we have tailed?
must you have tailed?
must they have tailed? 	must I have been tailing?
must you have been tailing?
must she have been tailing?
must we have been tailing?
must you have been tailing?
must they have been tailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tail?
mustn't you tail?
mustn't she tail?
mustn't we tail?
mustn't you tail?
mustn't they tail? 	mustn't I be tailing?
mustn't you be tailing?
mustn't she be tailing?
mustn't we be tailing?
mustn't you be tailing?
mustn't they be tailing? 	mustn't I have tailed?
mustn't you have tailed?
mustn't she have tailed?
mustn't we have tailed?
mustn't you have tailed?
mustn't they have tailed? 	mustn't I have been tailing?
mustn't you have been tailing?
mustn't she have been tailing?
mustn't we have been tailing?
mustn't you have been tailing?
mustn't they have been tailing?