English verb conjugation
CAN VAIL

Regular verb: vail - vailed - vailed

Affirmation

Simple form	V-ing form
I can vail you can vail she can vail we can vail you can vail they can vail	I can be vailing you can be vailing she can be vailing we can be vailing you can be vailing they can be vailing
Perfect	V-ing perfect
I can have vailed you can have vailed she can have vailed we can have vailed you can have vailed they can have vailed	I can have been vailing you can have been vailing she can have been vailing we can have been vailing you can have been vailing they can have been vailing

Negation

Simple form	V-ing form
I cannot vail you cannot vail she cannot vail we cannot vail you cannot vail they cannot vail	I cannot be vailing you cannot be vailing she cannot be vailing we cannot be vailing you cannot be vailing they cannot be vailing
Perfect	V-ing perfect
I cannot have vailed you cannot have vailed she cannot have vailed we cannot have vailed you cannot have vailed they cannot have vailed	I cannot have been vailing you cannot have been vailing she cannot have been vailing we cannot have been vailing you cannot have been vailing they cannot have been vailing

Interrogative form

Simple form	V-ing form
can I vail? can you vail? can she vail? can we vail? can you vail? can they vail?	can I be vailing? can you be vailing? can she be vailing? can we be vailing? can you be vailing? can they be vailing?
Perfect	V-ing perfect
can I have vailed? can you have vailed? can she have vailed? can we have vailed? can you have vailed? can they have vailed?	can I have been vailing? can you have been vailing? can she have been vailing? can we have been vailing? can you have been vailing? can they have been vailing?

Interro-negative form

Simple form	V-ing form
can I not vail? can you not vail? can she not vail? can we not vail? can you not vail? can they not vail?	can I not be vailing? can you not be vailing? can she not be vailing? can we not be vailing? can you not be vailing? can they not be vailing?
Perfect	V-ing perfect
can I not have vailed? can you not have vailed? can she not have vailed? can we not have vailed? can you not have vailed? can they not have vailed?	can I not have been vailing? can you not have been vailing? can she not have been vailing? can we not have been vailing? can you not have been vailing? can they not have been vailing?