English verb conjugation
COULD DIB

Regular verb: dib - dibed - dibed

Affirmation

Simple form	V-ing form
I could dib you could dib he could dib we could dib you could dib they could dib	I could be dibing you could be dibing he could be dibing we could be dibing you could be dibing they could be dibing
Perfect	V-ing perfect
I could have dibed you could have dibed he could have dibed we could have dibed you could have dibed they could have dibed	I could have been dibing you could have been dibing he could have been dibing we could have been dibing you could have been dibing they could have been dibing

Negation

Simple form	V-ing form
I couldn't dib you couldn't dib he couldn't dib we couldn't dib you couldn't dib they couldn't dib	I couldn't be dibing you couldn't be dibing he couldn't be dibing we couldn't be dibing you couldn't be dibing they couldn't be dibing
Perfect	V-ing perfect
I couldn't have dibed you couldn't have dibed he couldn't have dibed we couldn't have dibed you couldn't have dibed they couldn't have dibed	I couldn't have been dibing you couldn't have been dibing he couldn't have been dibing we couldn't have been dibing you couldn't have been dibing they couldn't have been dibing

Interrogative form

Simple form	V-ing form
could I dib? could you dib? could he dib? could we dib? could you dib? could they dib?	could I be dibing? could you be dibing? could he be dibing? could we be dibing? could you be dibing? could they be dibing?
Perfect	V-ing perfect
could I have dibed? could you have dibed? could he have dibed? could we have dibed? could you have dibed? could they have dibed?	could I have been dibing? could you have been dibing? could he have been dibing? could we have been dibing? could you have been dibing? could they have been dibing?

Interro-negative form

Simple form	V-ing form
couldn't I dib? couldn't you dib? couldn't he dib? couldn't we dib? couldn't you dib? couldn't they dib?	couldn't I be dibing? couldn't you be dibing? couldn't he be dibing? couldn't we be dibing? couldn't you be dibing? couldn't they be dibing?
Perfect	V-ing perfect
couldn't I have dibed? couldn't you have dibed? couldn't he have dibed? couldn't we have dibed? couldn't you have dibed? couldn't they have dibed?	couldn't I have been dibing? couldn't you have been dibing? couldn't he have been dibing? couldn't we have been dibing? couldn't you have been dibing? couldn't they have been dibing?