English verb conjugation
MUST SIN

Regular verb: sin - sinned - sinned

Affirmation

Simple form	V-ing form
I must sin you must sin she must sin we must sin you must sin they must sin	I must be sinning you must be sinning she must be sinning we must be sinning you must be sinning they must be sinning
Perfect	V-ing perfect
I must have sinned you must have sinned she must have sinned we must have sinned you must have sinned they must have sinned	I must have been sinning you must have been sinning she must have been sinning we must have been sinning you must have been sinning they must have been sinning

Negation

Simple form	V-ing form
I mustn't sin you mustn't sin she mustn't sin we mustn't sin you mustn't sin they mustn't sin	I mustn't be sinning you mustn't be sinning she mustn't be sinning we mustn't be sinning you mustn't be sinning they mustn't be sinning
Perfect	V-ing perfect
I mustn't have sinned you mustn't have sinned she mustn't have sinned we mustn't have sinned you mustn't have sinned they mustn't have sinned	I mustn't have been sinning you mustn't have been sinning she mustn't have been sinning we mustn't have been sinning you mustn't have been sinning they mustn't have been sinning

Interrogative form

Simple form	V-ing form
must I sin? must you sin? must she sin? must we sin? must you sin? must they sin?	must I be sinning? must you be sinning? must she be sinning? must we be sinning? must you be sinning? must they be sinning?
Perfect	V-ing perfect
must I have sinned? must you have sinned? must she have sinned? must we have sinned? must you have sinned? must they have sinned?	must I have been sinning? must you have been sinning? must she have been sinning? must we have been sinning? must you have been sinning? must they have been sinning?

Interro-negative form

Simple form	V-ing form
mustn't I sin? mustn't you sin? mustn't she sin? mustn't we sin? mustn't you sin? mustn't they sin?	mustn't I be sinning? mustn't you be sinning? mustn't she be sinning? mustn't we be sinning? mustn't you be sinning? mustn't they be sinning?
Perfect	V-ing perfect
mustn't I have sinned? mustn't you have sinned? mustn't she have sinned? mustn't we have sinned? mustn't you have sinned? mustn't they have sinned?	mustn't I have been sinning? mustn't you have been sinning? mustn't she have been sinning? mustn't we have been sinning? mustn't you have been sinning? mustn't they have been sinning?