English verb conjugation
MUST TWIN

Regular verb: twin - twinned - twinned

Affirmation

Simple form	V-ing form
I must twin you must twin he must twin we must twin you must twin they must twin	I must be twinning you must be twinning he 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 he 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 he 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 must not twin you must not twin he must not twin we must not twin you must not twin they must not twin	I must not be twinning you must not be twinning he must not be twinning we must not be twinning you must not be twinning they must not be twinning
Perfect	V-ing perfect
I must not have twinned you must not have twinned he must not have twinned we must not have twinned you must not have twinned they must not have twinned	I must not have been twinning you must not have been twinning he must not have been twinning we must not have been twinning you must not have been twinning they must not have been twinning

Interrogative form

Simple form	V-ing form
must I twin? must you twin? must he twin? must we twin? must you twin? must they twin?	must I be twinning? must you be twinning? must he 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 he 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 he 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
must I not twin? must you not twin? must he not twin? must we not twin? must you not twin? must they not twin?	must I not be twinning? must you not be twinning? must he not be twinning? must we not be twinning? must you not be twinning? must they not be twinning?
Perfect	V-ing perfect
must I not have twinned? must you not have twinned? must he not have twinned? must we not have twinned? must you not have twinned? must they not have twinned?	must I not have been twinning? must you not have been twinning? must he not have been twinning? must we not have been twinning? must you not have been twinning? must they not have been twinning?