English verb conjugation
MUST TAIL

Regular verb: tail - tailed - tailed

Affirmation

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