English verb conjugation
CAN BARB

Regular verb: barb - barbed - barbed

Affirmation

Simple form	V-ing form
I can barb you can barb he can barb we can barb you can barb they can barb	I can be barbing you can be barbing he can be barbing we can be barbing you can be barbing they can be barbing
Perfect	V-ing perfect
I can have barbed you can have barbed he can have barbed we can have barbed you can have barbed they can have barbed	I can have been barbing you can have been barbing he can have been barbing we can have been barbing you can have been barbing they can have been barbing

Negation

Simple form	V-ing form
I can't barb you can't barb he can't barb we can't barb you can't barb they can't barb	I can't be barbing you can't be barbing he can't be barbing we can't be barbing you can't be barbing they can't be barbing
Perfect	V-ing perfect
I can't have barbed you can't have barbed he can't have barbed we can't have barbed you can't have barbed they can't have barbed	I can't have been barbing you can't have been barbing he can't have been barbing we can't have been barbing you can't have been barbing they can't have been barbing

Interrogative form

Simple form	V-ing form
can I barb? can you barb? can he barb? can we barb? can you barb? can they barb?	can I be barbing? can you be barbing? can he be barbing? can we be barbing? can you be barbing? can they be barbing?
Perfect	V-ing perfect
can I have barbed? can you have barbed? can he have barbed? can we have barbed? can you have barbed? can they have barbed?	can I have been barbing? can you have been barbing? can he have been barbing? can we have been barbing? can you have been barbing? can they have been barbing?

Interro-negative form

Simple form	V-ing form
can't I barb? can't you barb? can't he barb? can't we barb? can't you barb? can't they barb?	can't I be barbing? can't you be barbing? can't he be barbing? can't we be barbing? can't you be barbing? can't they be barbing?
Perfect	V-ing perfect
can't I have barbed? can't you have barbed? can't he have barbed? can't we have barbed? can't you have barbed? can't they have barbed?	can't I have been barbing? can't you have been barbing? can't he have been barbing? can't we have been barbing? can't you have been barbing? can't they have been barbing?