must shirttail
Regular verb: shirttail - shirttailed- shirttailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?