English verb conjugation
COULD PRICK

Regular verb: prick - pricked - pricked

Affirmation

Simple form	V-ing form
I could prick you could prick she could prick we could prick you could prick they could prick	I could be pricking you could be pricking she could be pricking we could be pricking you could be pricking they could be pricking
Perfect	V-ing perfect
I could have pricked you could have pricked she could have pricked we could have pricked you could have pricked they could have pricked	I could have been pricking you could have been pricking she could have been pricking we could have been pricking you could have been pricking they could have been pricking

Negation

Simple form	V-ing form
I couldn't prick you couldn't prick she couldn't prick we couldn't prick you couldn't prick they couldn't prick	I couldn't be pricking you couldn't be pricking she couldn't be pricking we couldn't be pricking you couldn't be pricking they couldn't be pricking
Perfect	V-ing perfect
I couldn't have pricked you couldn't have pricked she couldn't have pricked we couldn't have pricked you couldn't have pricked they couldn't have pricked	I couldn't have been pricking you couldn't have been pricking she couldn't have been pricking we couldn't have been pricking you couldn't have been pricking they couldn't have been pricking

Interrogative form

Simple form	V-ing form
could I prick? could you prick? could she prick? could we prick? could you prick? could they prick?	could I be pricking? could you be pricking? could she be pricking? could we be pricking? could you be pricking? could they be pricking?
Perfect	V-ing perfect
could I have pricked? could you have pricked? could she have pricked? could we have pricked? could you have pricked? could they have pricked?	could I have been pricking? could you have been pricking? could she have been pricking? could we have been pricking? could you have been pricking? could they have been pricking?

Interro-negative form

Simple form	V-ing form
couldn't I prick? couldn't you prick? couldn't she prick? couldn't we prick? couldn't you prick? couldn't they prick?	couldn't I be pricking? couldn't you be pricking? couldn't she be pricking? couldn't we be pricking? couldn't you be pricking? couldn't they be pricking?
Perfect	V-ing perfect
couldn't I have pricked? couldn't you have pricked? couldn't she have pricked? couldn't we have pricked? couldn't you have pricked? couldn't they have pricked?	couldn't I have been pricking? couldn't you have been pricking? couldn't she have been pricking? couldn't we have been pricking? couldn't you have been pricking? couldn't they have been pricking?