English verb conjugation
MUST BOX

Regular verb: box - boxed - boxed

Affirmation

Simple form	V-ing form
I must box you must box he must box we must box you must box they must box	I must be boxing you must be boxing he must be boxing we must be boxing you must be boxing they must be boxing
Perfect	V-ing perfect
I must have boxed you must have boxed he must have boxed we must have boxed you must have boxed they must have boxed	I must have been boxing you must have been boxing he must have been boxing we must have been boxing you must have been boxing they must have been boxing

Negation

Simple form	V-ing form
I must not box you must not box he must not box we must not box you must not box they must not box	I must not be boxing you must not be boxing he must not be boxing we must not be boxing you must not be boxing they must not be boxing
Perfect	V-ing perfect
I must not have boxed you must not have boxed he must not have boxed we must not have boxed you must not have boxed they must not have boxed	I must not have been boxing you must not have been boxing he must not have been boxing we must not have been boxing you must not have been boxing they must not have been boxing

Interrogative form

Simple form	V-ing form
must I box? must you box? must he box? must we box? must you box? must they box?	must I be boxing? must you be boxing? must he be boxing? must we be boxing? must you be boxing? must they be boxing?
Perfect	V-ing perfect
must I have boxed? must you have boxed? must he have boxed? must we have boxed? must you have boxed? must they have boxed?	must I have been boxing? must you have been boxing? must he have been boxing? must we have been boxing? must you have been boxing? must they have been boxing?

Interro-negative form

Simple form	V-ing form
must I not box? must you not box? must he not box? must we not box? must you not box? must they not box?	must I not be boxing? must you not be boxing? must he not be boxing? must we not be boxing? must you not be boxing? must they not be boxing?
Perfect	V-ing perfect
must I not have boxed? must you not have boxed? must he not have boxed? must we not have boxed? must you not have boxed? must they not have boxed?	must I not have been boxing? must you not have been boxing? must he not have been boxing? must we not have been boxing? must you not have been boxing? must they not have been boxing?