I can shirttail you can shirttail he can shirttail we can shirttail you can shirttail they can shirttail
V-ing form
I can be shirttailing you can be shirttailing he can be shirttailing we can be shirttailing you can be shirttailing they can be shirttailing
Perfect
I can have shirttailed you can have shirttailed he can have shirttailed we can have shirttailed you can have shirttailed they can have shirttailed
V-ing perfect
I can have been shirttailing you can have been shirttailing he can have been shirttailing we can have been shirttailing you can have been shirttailing they can have been shirttailing
Negation
Simple form
I can't shirttail you can't shirttail he can't shirttail we can't shirttail you can't shirttail they can't shirttail
V-ing form
I can't be shirttailing you can't be shirttailing he can't be shirttailing we can't be shirttailing you can't be shirttailing they can't be shirttailing
Perfect
I can't have shirttailed you can't have shirttailed he can't have shirttailed we can't have shirttailed you can't have shirttailed they can't have shirttailed
V-ing perfect
I can't have been shirttailing you can't have been shirttailing he can't have been shirttailing we can't have been shirttailing you can't have been shirttailing they can't have been shirttailing
Interrogative form
Simple form
can I shirttail? can you shirttail? can he shirttail? can we shirttail? can you shirttail? can they shirttail?
V-ing form
can I be shirttailing? can you be shirttailing? can he be shirttailing? can we be shirttailing? can you be shirttailing? can they be shirttailing?
Perfect
can I have shirttailed? can you have shirttailed? can he have shirttailed? can we have shirttailed? can you have shirttailed? can they have shirttailed?
V-ing perfect
can I have been shirttailing? can you have been shirttailing? can he have been shirttailing? can we have been shirttailing? can you have been shirttailing? can they have been shirttailing?
Interro-negative form
Simple form
can't I shirttail? can't you shirttail? can't he shirttail? can't we shirttail? can't you shirttail? can't they shirttail?
V-ing form
can't I be shirttailing? can't you be shirttailing? can't he be shirttailing? can't we be shirttailing? can't you be shirttailing? can't they be shirttailing?
Perfect
can't I have shirttailed? can't you have shirttailed? can't he have shirttailed? can't we have shirttailed? can't you have shirttailed? can't they have shirttailed?
V-ing perfect
can't I have been shirttailing? can't you have been shirttailing? can't he have been shirttailing? can't we have been shirttailing? can't you have been shirttailing? can't they have been shirttailing?