English verb conjugation
CAN TAIL

Regular verb: tail - tailed - tailed

Affirmation

Simple form	V-ing form
I can tail you can tail he can tail we can tail you can tail they can tail	I can be tailing you can be tailing he can be tailing we can be tailing you can be tailing they can be tailing
Perfect	V-ing perfect
I can have tailed you can have tailed he can have tailed we can have tailed you can have tailed they can have tailed	I can have been tailing you can have been tailing he can have been tailing we can have been tailing you can have been tailing they can have been tailing

Negation

Simple form	V-ing form
I can't tail you can't tail he can't tail we can't tail you can't tail they can't tail	I can't be tailing you can't be tailing he can't be tailing we can't be tailing you can't be tailing they can't be tailing
Perfect	V-ing perfect
I can't have tailed you can't have tailed he can't have tailed we can't have tailed you can't have tailed they can't have tailed	I can't have been tailing you can't have been tailing he can't have been tailing we can't have been tailing you can't have been tailing they can't have been tailing

Interrogative form

Simple form	V-ing form
can I tail? can you tail? can he tail? can we tail? can you tail? can they tail?	can I be tailing? can you be tailing? can he be tailing? can we be tailing? can you be tailing? can they be tailing?
Perfect	V-ing perfect
can I have tailed? can you have tailed? can he have tailed? can we have tailed? can you have tailed? can they have tailed?	can I have been tailing? can you have been tailing? can he have been tailing? can we have been tailing? can you have been tailing? can they have been tailing?

Interro-negative form

Simple form	V-ing form
can't I tail? can't you tail? can't he tail? can't we tail? can't you tail? can't they tail?	can't I be tailing? can't you be tailing? can't he be tailing? can't we be tailing? can't you be tailing? can't they be tailing?
Perfect	V-ing perfect
can't I have tailed? can't you have tailed? can't he have tailed? can't we have tailed? can't you have tailed? can't they have tailed?	can't I have been tailing? can't you have been tailing? can't he have been tailing? can't we have been tailing? can't you have been tailing? can't they have been tailing?