English verb conjugation
MUST CO-STAR

Regular verb: co-star - co-stared - co-stared

Affirmation

Simple form	V-ing form
I must co-star you must co-star he must co-star we must co-star you must co-star they must co-star	I must be co-staring you must be co-staring he must be co-staring we must be co-staring you must be co-staring they must be co-staring
Perfect	V-ing perfect
I must have co-stared you must have co-stared he must have co-stared we must have co-stared you must have co-stared they must have co-stared	I must have been co-staring you must have been co-staring he must have been co-staring we must have been co-staring you must have been co-staring they must have been co-staring

Negation

Simple form	V-ing form
I must not co-star you must not co-star he must not co-star we must not co-star you must not co-star they must not co-star	I must not be co-staring you must not be co-staring he must not be co-staring we must not be co-staring you must not be co-staring they must not be co-staring
Perfect	V-ing perfect
I must not have co-stared you must not have co-stared he must not have co-stared we must not have co-stared you must not have co-stared they must not have co-stared	I must not have been co-staring you must not have been co-staring he must not have been co-staring we must not have been co-staring you must not have been co-staring they must not have been co-staring

Interrogative form

Simple form	V-ing form
must I co-star? must you co-star? must he co-star? must we co-star? must you co-star? must they co-star?	must I be co-staring? must you be co-staring? must he be co-staring? must we be co-staring? must you be co-staring? must they be co-staring?
Perfect	V-ing perfect
must I have co-stared? must you have co-stared? must he have co-stared? must we have co-stared? must you have co-stared? must they have co-stared?	must I have been co-staring? must you have been co-staring? must he have been co-staring? must we have been co-staring? must you have been co-staring? must they have been co-staring?

Interro-negative form

Simple form	V-ing form
must I not co-star? must you not co-star? must he not co-star? must we not co-star? must you not co-star? must they not co-star?	must I not be co-staring? must you not be co-staring? must he not be co-staring? must we not be co-staring? must you not be co-staring? must they not be co-staring?
Perfect	V-ing perfect
must I not have co-stared? must you not have co-stared? must he not have co-stared? must we not have co-stared? must you not have co-stared? must they not have co-stared?	must I not have been co-staring? must you not have been co-staring? must he not have been co-staring? must we not have been co-staring? must you not have been co-staring? must they not have been co-staring?