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