English verb conjugation
MUST SHIRTTAIL

Regular verb: shirttail - shirttailed - shirttailed

Affirmation

Simple form	V-ing form
I must shirttail you must shirttail he must shirttail we must shirttail you must shirttail they must shirttail	I must be shirttailing you must be shirttailing he must be shirttailing we must be shirttailing you must be shirttailing they must be shirttailing
Perfect	V-ing perfect
I must have shirttailed you must have shirttailed he must have shirttailed we must have shirttailed you must have shirttailed they must have shirttailed	I must have been shirttailing you must have been shirttailing he must have been shirttailing we must have been shirttailing you must have been shirttailing they must have been shirttailing

Negation

Simple form	V-ing form
I must not shirttail you must not shirttail he must not shirttail we must not shirttail you must not shirttail they must not shirttail	I must not be shirttailing you must not be shirttailing he must not be shirttailing we must not be shirttailing you must not be shirttailing they must not be shirttailing
Perfect	V-ing perfect
I must not have shirttailed you must not have shirttailed he must not have shirttailed we must not have shirttailed you must not have shirttailed they must not have shirttailed	I must not have been shirttailing you must not have been shirttailing he must not have been shirttailing we must not have been shirttailing you must not have been shirttailing they must not have been shirttailing

Interrogative form

Simple form	V-ing form
must I shirttail? must you shirttail? must he shirttail? must we shirttail? must you shirttail? must they shirttail?	must I be shirttailing? must you be shirttailing? must he be shirttailing? must we be shirttailing? must you be shirttailing? must they be shirttailing?
Perfect	V-ing perfect
must I have shirttailed? must you have shirttailed? must he have shirttailed? must we have shirttailed? must you have shirttailed? must they have shirttailed?	must I have been shirttailing? must you have been shirttailing? must he have been shirttailing? must we have been shirttailing? must you have been shirttailing? must they have been shirttailing?

Interro-negative form

Simple form	V-ing form
must I not shirttail? must you not shirttail? must he not shirttail? must we not shirttail? must you not shirttail? must they not shirttail?	must I not be shirttailing? must you not be shirttailing? must he not be shirttailing? must we not be shirttailing? must you not be shirttailing? must they not be shirttailing?
Perfect	V-ing perfect
must I not have shirttailed? must you not have shirttailed? must he not have shirttailed? must we not have shirttailed? must you not have shirttailed? must they not have shirttailed?	must I not have been shirttailing? must you not have been shirttailing? must he not have been shirttailing? must we not have been shirttailing? must you not have been shirttailing? must they not have been shirttailing?