English verb conjugation
CAN AIL

Regular verb: ail - ailed - ailed

Affirmation

Simple form	V-ing form
I can ail you can ail he can ail we can ail you can ail they can ail	I can be ailing you can be ailing he can be ailing we can be ailing you can be ailing they can be ailing
Perfect	V-ing perfect
I can have ailed you can have ailed he can have ailed we can have ailed you can have ailed they can have ailed	I can have been ailing you can have been ailing he can have been ailing we can have been ailing you can have been ailing they can have been ailing

Negation

Simple form	V-ing form
I can't ail you can't ail he can't ail we can't ail you can't ail they can't ail	I can't be ailing you can't be ailing he can't be ailing we can't be ailing you can't be ailing they can't be ailing
Perfect	V-ing perfect
I can't have ailed you can't have ailed he can't have ailed we can't have ailed you can't have ailed they can't have ailed	I can't have been ailing you can't have been ailing he can't have been ailing we can't have been ailing you can't have been ailing they can't have been ailing

Interrogative form

Simple form	V-ing form
can I ail? can you ail? can he ail? can we ail? can you ail? can they ail?	can I be ailing? can you be ailing? can he be ailing? can we be ailing? can you be ailing? can they be ailing?
Perfect	V-ing perfect
can I have ailed? can you have ailed? can he have ailed? can we have ailed? can you have ailed? can they have ailed?	can I have been ailing? can you have been ailing? can he have been ailing? can we have been ailing? can you have been ailing? can they have been ailing?

Interro-negative form

Simple form	V-ing form
can't I ail? can't you ail? can't he ail? can't we ail? can't you ail? can't they ail?	can't I be ailing? can't you be ailing? can't he be ailing? can't we be ailing? can't you be ailing? can't they be ailing?
Perfect	V-ing perfect
can't I have ailed? can't you have ailed? can't he have ailed? can't we have ailed? can't you have ailed? can't they have ailed?	can't I have been ailing? can't you have been ailing? can't he have been ailing? can't we have been ailing? can't you have been ailing? can't they have been ailing?