English verb conjugation
MUST RET

Regular verb: ret - retted - retted

Affirmation

Simple form	V-ing form
I must ret you must ret he must ret we must ret you must ret they must ret	I must be retting you must be retting he must be retting we must be retting you must be retting they must be retting
Perfect	V-ing perfect
I must have retted you must have retted he must have retted we must have retted you must have retted they must have retted	I must have been retting you must have been retting he must have been retting we must have been retting you must have been retting they must have been retting

Negation

Simple form	V-ing form
I mustn't ret you mustn't ret he mustn't ret we mustn't ret you mustn't ret they mustn't ret	I mustn't be retting you mustn't be retting he mustn't be retting we mustn't be retting you mustn't be retting they mustn't be retting
Perfect	V-ing perfect
I mustn't have retted you mustn't have retted he mustn't have retted we mustn't have retted you mustn't have retted they mustn't have retted	I mustn't have been retting you mustn't have been retting he mustn't have been retting we mustn't have been retting you mustn't have been retting they mustn't have been retting

Interrogative form

Simple form	V-ing form
must I ret? must you ret? must he ret? must we ret? must you ret? must they ret?	must I be retting? must you be retting? must he be retting? must we be retting? must you be retting? must they be retting?
Perfect	V-ing perfect
must I have retted? must you have retted? must he have retted? must we have retted? must you have retted? must they have retted?	must I have been retting? must you have been retting? must he have been retting? must we have been retting? must you have been retting? must they have been retting?

Interro-negative form

Simple form	V-ing form
mustn't I ret? mustn't you ret? mustn't he ret? mustn't we ret? mustn't you ret? mustn't they ret?	mustn't I be retting? mustn't you be retting? mustn't he be retting? mustn't we be retting? mustn't you be retting? mustn't they be retting?
Perfect	V-ing perfect
mustn't I have retted? mustn't you have retted? mustn't he have retted? mustn't we have retted? mustn't you have retted? mustn't they have retted?	mustn't I have been retting? mustn't you have been retting? mustn't he have been retting? mustn't we have been retting? mustn't you have been retting? mustn't they have been retting?