English verb conjugation
CAN CO-STAR

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

Affirmation

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

Negation

Simple form	V-ing form
I can't co-star you can't co-star he can't co-star we can't co-star you can't co-star they can't co-star	I can't be co-staring you can't be co-staring he can't be co-staring we can't be co-staring you can't be co-staring they can't be co-staring
Perfect	V-ing perfect
I can't have co-stared you can't have co-stared he can't have co-stared we can't have co-stared you can't have co-stared they can't have co-stared	I can't have been co-staring you can't have been co-staring he can't have been co-staring we can't have been co-staring you can't have been co-staring they can't have been co-staring

Interrogative form

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

Interro-negative form

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