English verb conjugation
CAN NAIL

Regular verb: nail - nailed - nailed

Affirmation

Simple form	V-ing form
I can nail you can nail she can nail we can nail you can nail they can nail	I can be nailing you can be nailing she 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 she 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 she 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 cannot nail you cannot nail she cannot nail we cannot nail you cannot nail they cannot nail	I cannot be nailing you cannot be nailing she cannot be nailing we cannot be nailing you cannot be nailing they cannot be nailing
Perfect	V-ing perfect
I cannot have nailed you cannot have nailed she cannot have nailed we cannot have nailed you cannot have nailed they cannot have nailed	I cannot have been nailing you cannot have been nailing she cannot have been nailing we cannot have been nailing you cannot have been nailing they cannot have been nailing

Interrogative form

Simple form	V-ing form
can I nail? can you nail? can she nail? can we nail? can you nail? can they nail?	can I be nailing? can you be nailing? can she 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 she 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 she 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 I not nail? can you not nail? can she not nail? can we not nail? can you not nail? can they not nail?	can I not be nailing? can you not be nailing? can she not be nailing? can we not be nailing? can you not be nailing? can they not be nailing?
Perfect	V-ing perfect
can I not have nailed? can you not have nailed? can she not have nailed? can we not have nailed? can you not have nailed? can they not have nailed?	can I not have been nailing? can you not have been nailing? can she not have been nailing? can we not have been nailing? can you not have been nailing? can they not have been nailing?