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 can't airmail you can't airmail he can't airmail we can't airmail you can't airmail they can't airmail	I can't be airmailing you can't be airmailing he can't be airmailing we can't be airmailing you can't be airmailing they can't be airmailing
Perfect	V-ing perfect
I can't have airmailed you can't have airmailed he can't have airmailed we can't have airmailed you can't have airmailed they can't have airmailed	I can't have been airmailing you can't have been airmailing he can't have been airmailing we can't have been airmailing you can't have been airmailing they can't 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't I airmail? can't you airmail? can't he airmail? can't we airmail? can't you airmail? can't they airmail?	can't I be airmailing? can't you be airmailing? can't he be airmailing? can't we be airmailing? can't you be airmailing? can't they be airmailing?
Perfect	V-ing perfect
can't I have airmailed? can't you have airmailed? can't he have airmailed? can't we have airmailed? can't you have airmailed? can't they have airmailed?	can't I have been airmailing? can't you have been airmailing? can't he have been airmailing? can't we have been airmailing? can't you have been airmailing? can't they have been airmailing?