English verb conjugation
COULD BARB

Regular verb: barb - barbed - barbed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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