English verb conjugation
MUST TWIN

Regular verb: twin - twinned - twinned

Affirmation

Simple form	V-ing form
I must twin you must twin she must twin we must twin you must twin they must twin	I must be twinning you must be twinning she must be twinning we must be twinning you must be twinning they must be twinning
Perfect	V-ing perfect
I must have twinned you must have twinned she must have twinned we must have twinned you must have twinned they must have twinned	I must have been twinning you must have been twinning she must have been twinning we must have been twinning you must have been twinning they must have been twinning

Negation

Simple form	V-ing form
I mustn't twin you mustn't twin she mustn't twin we mustn't twin you mustn't twin they mustn't twin	I mustn't be twinning you mustn't be twinning she mustn't be twinning we mustn't be twinning you mustn't be twinning they mustn't be twinning
Perfect	V-ing perfect
I mustn't have twinned you mustn't have twinned she mustn't have twinned we mustn't have twinned you mustn't have twinned they mustn't have twinned	I mustn't have been twinning you mustn't have been twinning she mustn't have been twinning we mustn't have been twinning you mustn't have been twinning they mustn't have been twinning

Interrogative form

Simple form	V-ing form
must I twin? must you twin? must she twin? must we twin? must you twin? must they twin?	must I be twinning? must you be twinning? must she be twinning? must we be twinning? must you be twinning? must they be twinning?
Perfect	V-ing perfect
must I have twinned? must you have twinned? must she have twinned? must we have twinned? must you have twinned? must they have twinned?	must I have been twinning? must you have been twinning? must she have been twinning? must we have been twinning? must you have been twinning? must they have been twinning?

Interro-negative form

Simple form	V-ing form
mustn't I twin? mustn't you twin? mustn't she twin? mustn't we twin? mustn't you twin? mustn't they twin?	mustn't I be twinning? mustn't you be twinning? mustn't she be twinning? mustn't we be twinning? mustn't you be twinning? mustn't they be twinning?
Perfect	V-ing perfect
mustn't I have twinned? mustn't you have twinned? mustn't she have twinned? mustn't we have twinned? mustn't you have twinned? mustn't they have twinned?	mustn't I have been twinning? mustn't you have been twinning? mustn't she have been twinning? mustn't we have been twinning? mustn't you have been twinning? mustn't they have been twinning?