English verb conjugation
COULD CRIB

Regular verb: crib - cribbed - cribbed

Affirmation

Simple form	V-ing form
I could crib you could crib he could crib we could crib you could crib they could crib	I could be cribbing you could be cribbing he could be cribbing we could be cribbing you could be cribbing they could be cribbing
Perfect	V-ing perfect
I could have cribbed you could have cribbed he could have cribbed we could have cribbed you could have cribbed they could have cribbed	I could have been cribbing you could have been cribbing he could have been cribbing we could have been cribbing you could have been cribbing they could have been cribbing

Negation

Simple form	V-ing form
I couldn't crib you couldn't crib he couldn't crib we couldn't crib you couldn't crib they couldn't crib	I couldn't be cribbing you couldn't be cribbing he couldn't be cribbing we couldn't be cribbing you couldn't be cribbing they couldn't be cribbing
Perfect	V-ing perfect
I couldn't have cribbed you couldn't have cribbed he couldn't have cribbed we couldn't have cribbed you couldn't have cribbed they couldn't have cribbed	I couldn't have been cribbing you couldn't have been cribbing he couldn't have been cribbing we couldn't have been cribbing you couldn't have been cribbing they couldn't have been cribbing

Interrogative form

Simple form	V-ing form
could I crib? could you crib? could he crib? could we crib? could you crib? could they crib?	could I be cribbing? could you be cribbing? could he be cribbing? could we be cribbing? could you be cribbing? could they be cribbing?
Perfect	V-ing perfect
could I have cribbed? could you have cribbed? could he have cribbed? could we have cribbed? could you have cribbed? could they have cribbed?	could I have been cribbing? could you have been cribbing? could he have been cribbing? could we have been cribbing? could you have been cribbing? could they have been cribbing?

Interro-negative form

Simple form	V-ing form
couldn't I crib? couldn't you crib? couldn't he crib? couldn't we crib? couldn't you crib? couldn't they crib?	couldn't I be cribbing? couldn't you be cribbing? couldn't he be cribbing? couldn't we be cribbing? couldn't you be cribbing? couldn't they be cribbing?
Perfect	V-ing perfect
couldn't I have cribbed? couldn't you have cribbed? couldn't he have cribbed? couldn't we have cribbed? couldn't you have cribbed? couldn't they have cribbed?	couldn't I have been cribbing? couldn't you have been cribbing? couldn't he have been cribbing? couldn't we have been cribbing? couldn't you have been cribbing? couldn't they have been cribbing?