English verb conjugation
MUST AIRMAIL

Regular verb: airmail - airmailed - airmailed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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