English verb conjugation
MUST RET

Regular verb: ret - retted - retted

Affirmation

Simple form	V-ing form
I must ret you must ret she must ret we must ret you must ret they must ret	I must be retting you must be retting she 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 she 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 she 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 she 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 she 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 she 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 she 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 she ret? must we ret? must you ret? must they ret?	must I be retting? must you be retting? must she 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 she 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 she 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 she 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 she 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 she 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 she have been retting? mustn't we have been retting? mustn't you have been retting? mustn't they have been retting?