English verb conjugation
MUST PREP

Regular verb: prep - preped - preped

Affirmation

Simple form	V-ing form
I must prep you must prep she must prep we must prep you must prep they must prep	I must be preping you must be preping she 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 she 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 she 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 mustn't prep you mustn't prep she mustn't prep we mustn't prep you mustn't prep they mustn't prep	I mustn't be preping you mustn't be preping she mustn't be preping we mustn't be preping you mustn't be preping they mustn't be preping
Perfect	V-ing perfect
I mustn't have preped you mustn't have preped she mustn't have preped we mustn't have preped you mustn't have preped they mustn't have preped	I mustn't have been preping you mustn't have been preping she mustn't have been preping we mustn't have been preping you mustn't have been preping they mustn't have been preping

Interrogative form

Simple form	V-ing form
must I prep? must you prep? must she prep? must we prep? must you prep? must they prep?	must I be preping? must you be preping? must she 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 she 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 she 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
mustn't I prep? mustn't you prep? mustn't she prep? mustn't we prep? mustn't you prep? mustn't they prep?	mustn't I be preping? mustn't you be preping? mustn't she be preping? mustn't we be preping? mustn't you be preping? mustn't they be preping?
Perfect	V-ing perfect
mustn't I have preped? mustn't you have preped? mustn't she have preped? mustn't we have preped? mustn't you have preped? mustn't they have preped?	mustn't I have been preping? mustn't you have been preping? mustn't she have been preping? mustn't we have been preping? mustn't you have been preping? mustn't they have been preping?