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 mustn't co-star you mustn't co-star he mustn't co-star we mustn't co-star you mustn't co-star they mustn't co-star	I mustn't be co-staring you mustn't be co-staring he mustn't be co-staring we mustn't be co-staring you mustn't be co-staring they mustn't be co-staring
Perfect	V-ing perfect
I mustn't have co-stared you mustn't have co-stared he mustn't have co-stared we mustn't have co-stared you mustn't have co-stared they mustn't have co-stared	I mustn't have been co-staring you mustn't have been co-staring he mustn't have been co-staring we mustn't have been co-staring you mustn't have been co-staring they mustn't 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
mustn't I co-star? mustn't you co-star? mustn't he co-star? mustn't we co-star? mustn't you co-star? mustn't they co-star?	mustn't I be co-staring? mustn't you be co-staring? mustn't he be co-staring? mustn't we be co-staring? mustn't you be co-staring? mustn't they be co-staring?
Perfect	V-ing perfect
mustn't I have co-stared? mustn't you have co-stared? mustn't he have co-stared? mustn't we have co-stared? mustn't you have co-stared? mustn't they have co-stared?	mustn't I have been co-staring? mustn't you have been co-staring? mustn't he have been co-staring? mustn't we have been co-staring? mustn't you have been co-staring? mustn't they have been co-staring?