I must shirttail you must shirttail he must shirttail we must shirttail you must shirttail they must shirttail
Forme en V-ing
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
I must have shirttailed you must have shirttailed he must have shirttailed we must have shirttailed you must have shirttailed they must have shirttailed
Perfect en V-ing
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
Négation
Forme simple
I mustn't shirttail you mustn't shirttail he mustn't shirttail we mustn't shirttail you mustn't shirttail they mustn't shirttail
Forme en V-ing
I mustn't be shirttailing you mustn't be shirttailing he mustn't be shirttailing we mustn't be shirttailing you mustn't be shirttailing they mustn't be shirttailing
Perfect
I mustn't have shirttailed you mustn't have shirttailed he mustn't have shirttailed we mustn't have shirttailed you mustn't have shirttailed they mustn't have shirttailed
Perfect en V-ing
I mustn't have been shirttailing you mustn't have been shirttailing he mustn't have been shirttailing we mustn't have been shirttailing you mustn't have been shirttailing they mustn't have been shirttailing
Forme interrogative
Forme simple
must I shirttail? must you shirttail? must he shirttail? must we shirttail? must you shirttail? must they shirttail?
Forme en V-ing
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
must I have shirttailed? must you have shirttailed? must he have shirttailed? must we have shirttailed? must you have shirttailed? must they have shirttailed?
Perfect en V-ing
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?
Forme interro-négative
Forme simple
mustn't I shirttail? mustn't you shirttail? mustn't he shirttail? mustn't we shirttail? mustn't you shirttail? mustn't they shirttail?
Forme en V-ing
mustn't I be shirttailing? mustn't you be shirttailing? mustn't he be shirttailing? mustn't we be shirttailing? mustn't you be shirttailing? mustn't they be shirttailing?
Perfect
mustn't I have shirttailed? mustn't you have shirttailed? mustn't he have shirttailed? mustn't we have shirttailed? mustn't you have shirttailed? mustn't they have shirttailed?
Perfect en V-ing
mustn't I have been shirttailing? mustn't you have been shirttailing? mustn't he have been shirttailing? mustn't we have been shirttailing? mustn't you have been shirttailing? mustn't they have been shirttailing?