I can nail you can nail he can nail we can nail you can nail they can nail
V-ing form
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
I can have nailed you can have nailed he can have nailed we can have nailed you can have nailed they can have nailed
V-ing perfect
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
I can't nail you can't nail he can't nail we can't nail you can't nail they can't nail
V-ing form
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
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
V-ing perfect
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
can I nail? can you nail? can he nail? can we nail? can you nail? can they nail?
V-ing form
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
can I have nailed? can you have nailed? can he have nailed? can we have nailed? can you have nailed? can they have nailed?
V-ing perfect
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
can't I nail? can't you nail? can't he nail? can't we nail? can't you nail? can't they nail?
V-ing form
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
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?
V-ing perfect
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?