English verb conjugation
CAN NAIL

Regular verb: nail - nailed - nailed

Affirmation

Simple form	V-ing form
I can nail you can nail he can nail we can nail you can nail they can nail	I can be nailing you can be nailing he can be nailing we can be nailing you can be nailing they can be nailing
Perfect	V-ing perfect
I can have nailed you can have nailed he can have nailed we can have nailed you can have nailed they can have nailed	I can have been nailing you can have been nailing he can have been nailing we can have been nailing you can have been nailing they can have been nailing

Negation

Simple form	V-ing form
I can't nail you can't nail he can't nail we can't nail you can't nail they can't nail	I can't be nailing you can't be nailing he can't be nailing we can't be nailing you can't be nailing they can't be nailing
Perfect	V-ing perfect
I can't have nailed you can't have nailed he can't have nailed we can't have nailed you can't have nailed they can't have nailed	I can't have been nailing you can't have been nailing he can't have been nailing we can't have been nailing you can't have been nailing they can't have been nailing

Interrogative form

Simple form	V-ing form
can I nail? can you nail? can he nail? can we nail? can you nail? can they nail?	can I be nailing? can you be nailing? can he be nailing? can we be nailing? can you be nailing? can they be nailing?
Perfect	V-ing perfect
can I have nailed? can you have nailed? can he have nailed? can we have nailed? can you have nailed? can they have nailed?	can I have been nailing? can you have been nailing? can he have been nailing? can we have been nailing? can you have been nailing? can they have been nailing?

Interro-negative form

Simple form	V-ing form
can't I nail? can't you nail? can't he nail? can't we nail? can't you nail? can't they nail?	can't I be nailing? can't you be nailing? can't he be nailing? can't we be nailing? can't you be nailing? can't they be nailing?
Perfect	V-ing perfect
can't I have nailed? can't you have nailed? can't he have nailed? can't we have nailed? can't you have nailed? can't they have nailed?	can't I have been nailing? can't you have been nailing? can't he have been nailing? can't we have been nailing? can't you have been nailing? can't they have been nailing?