can airmail
Regular verb: airmail - airmailed- airmailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?