English verb conjugation
CAN AIRMAIL

Regular verb: airmail - airmailed - airmailed

Affirmation

Simple form	V-ing form
I can airmail you can airmail he can airmail we can airmail you can airmail they can airmail	I can be airmailing you can be airmailing he can be airmailing we can be airmailing you can be airmailing they can be airmailing
Perfect	V-ing perfect
I can have airmailed you can have airmailed he can have airmailed we can have airmailed you can have airmailed they can have airmailed	I can have been airmailing you can have been airmailing he can have been airmailing we can have been airmailing you can have been airmailing they can have been airmailing

Negation

Simple form	V-ing form
I cannot airmail you cannot airmail he cannot airmail we cannot airmail you cannot airmail they cannot airmail	I cannot be airmailing you cannot be airmailing he cannot be airmailing we cannot be airmailing you cannot be airmailing they cannot be airmailing
Perfect	V-ing perfect
I cannot have airmailed you cannot have airmailed he cannot have airmailed we cannot have airmailed you cannot have airmailed they cannot have airmailed	I cannot have been airmailing you cannot have been airmailing he cannot have been airmailing we cannot have been airmailing you cannot have been airmailing they cannot have been airmailing

Interrogative form

Simple form	V-ing form
can I airmail? can you airmail? can he airmail? can we airmail? can you airmail? can they airmail?	can I be airmailing? can you be airmailing? can he be airmailing? can we be airmailing? can you be airmailing? can they be airmailing?
Perfect	V-ing perfect
can I have airmailed? can you have airmailed? can he have airmailed? can we have airmailed? can you have airmailed? can they have airmailed?	can I have been airmailing? can you have been airmailing? can he have been airmailing? can we have been airmailing? can you have been airmailing? can they have been airmailing?

Interro-negative form

Simple form	V-ing form
can I not airmail? can you not airmail? can he not airmail? can we not airmail? can you not airmail? can they not airmail?	can I not be airmailing? can you not be airmailing? can he not be airmailing? can we not be airmailing? can you not be airmailing? can they not be airmailing?
Perfect	V-ing perfect
can I not have airmailed? can you not have airmailed? can he not have airmailed? can we not have airmailed? can you not have airmailed? can they not have airmailed?	can I not have been airmailing? can you not have been airmailing? can he not have been airmailing? can we not have been airmailing? can you not have been airmailing? can they not have been airmailing?