English verb conjugation
MUST PREP

Regular verb: prep - preped - preped

Affirmation

Simple form	V-ing form
I must prep you must prep he must prep we must prep you must prep they must prep	I must be preping you must be preping he must be preping we must be preping you must be preping they must be preping
Perfect	V-ing perfect
I must have preped you must have preped he must have preped we must have preped you must have preped they must have preped	I must have been preping you must have been preping he must have been preping we must have been preping you must have been preping they must have been preping

Negation

Simple form	V-ing form
I must not prep you must not prep he must not prep we must not prep you must not prep they must not prep	I must not be preping you must not be preping he must not be preping we must not be preping you must not be preping they must not be preping
Perfect	V-ing perfect
I must not have preped you must not have preped he must not have preped we must not have preped you must not have preped they must not have preped	I must not have been preping you must not have been preping he must not have been preping we must not have been preping you must not have been preping they must not have been preping

Interrogative form

Simple form	V-ing form
must I prep? must you prep? must he prep? must we prep? must you prep? must they prep?	must I be preping? must you be preping? must he be preping? must we be preping? must you be preping? must they be preping?
Perfect	V-ing perfect
must I have preped? must you have preped? must he have preped? must we have preped? must you have preped? must they have preped?	must I have been preping? must you have been preping? must he have been preping? must we have been preping? must you have been preping? must they have been preping?

Interro-negative form

Simple form	V-ing form
must I not prep? must you not prep? must he not prep? must we not prep? must you not prep? must they not prep?	must I not be preping? must you not be preping? must he not be preping? must we not be preping? must you not be preping? must they not be preping?
Perfect	V-ing perfect
must I not have preped? must you not have preped? must he not have preped? must we not have preped? must you not have preped? must they not have preped?	must I not have been preping? must you not have been preping? must he not have been preping? must we not have been preping? must you not have been preping? must they not have been preping?