English verb conjugation
MUST MORTISE

Regular verb: mortise - mortised - mortised

Affirmation

Simple form	V-ing form
I must mortise you must mortise he must mortise we must mortise you must mortise they must mortise	I must be mortising you must be mortising he must be mortising we must be mortising you must be mortising they must be mortising
Perfect	V-ing perfect
I must have mortised you must have mortised he must have mortised we must have mortised you must have mortised they must have mortised	I must have been mortising you must have been mortising he must have been mortising we must have been mortising you must have been mortising they must have been mortising

Negation

Simple form	V-ing form
I must not mortise you must not mortise he must not mortise we must not mortise you must not mortise they must not mortise	I must not be mortising you must not be mortising he must not be mortising we must not be mortising you must not be mortising they must not be mortising
Perfect	V-ing perfect
I must not have mortised you must not have mortised he must not have mortised we must not have mortised you must not have mortised they must not have mortised	I must not have been mortising you must not have been mortising he must not have been mortising we must not have been mortising you must not have been mortising they must not have been mortising

Interrogative form

Simple form	V-ing form
must I mortise? must you mortise? must he mortise? must we mortise? must you mortise? must they mortise?	must I be mortising? must you be mortising? must he be mortising? must we be mortising? must you be mortising? must they be mortising?
Perfect	V-ing perfect
must I have mortised? must you have mortised? must he have mortised? must we have mortised? must you have mortised? must they have mortised?	must I have been mortising? must you have been mortising? must he have been mortising? must we have been mortising? must you have been mortising? must they have been mortising?

Interro-negative form

Simple form	V-ing form
must I not mortise? must you not mortise? must he not mortise? must we not mortise? must you not mortise? must they not mortise?	must I not be mortising? must you not be mortising? must he not be mortising? must we not be mortising? must you not be mortising? must they not be mortising?
Perfect	V-ing perfect
must I not have mortised? must you not have mortised? must he not have mortised? must we not have mortised? must you not have mortised? must they not have mortised?	must I not have been mortising? must you not have been mortising? must he not have been mortising? must we not have been mortising? must you not have been mortising? must they not have been mortising?