English verb conjugation
COULD CURR

Regular verb: curr - curred - curred

Affirmation

Simple form	V-ing form
I could curr you could curr he could curr we could curr you could curr they could curr	I could be curring you could be curring he could be curring we could be curring you could be curring they could be curring
Perfect	V-ing perfect
I could have curred you could have curred he could have curred we could have curred you could have curred they could have curred	I could have been curring you could have been curring he could have been curring we could have been curring you could have been curring they could have been curring

Negation

Simple form	V-ing form
I could not curr you could not curr he could not curr we could not curr you could not curr they could not curr	I could not be curring you could not be curring he could not be curring we could not be curring you could not be curring they could not be curring
Perfect	V-ing perfect
I could not have curred you could not have curred he could not have curred we could not have curred you could not have curred they could not have curred	I could not have been curring you could not have been curring he could not have been curring we could not have been curring you could not have been curring they could not have been curring

Interrogative form

Simple form	V-ing form
could I curr? could you curr? could he curr? could we curr? could you curr? could they curr?	could I be curring? could you be curring? could he be curring? could we be curring? could you be curring? could they be curring?
Perfect	V-ing perfect
could I have curred? could you have curred? could he have curred? could we have curred? could you have curred? could they have curred?	could I have been curring? could you have been curring? could he have been curring? could we have been curring? could you have been curring? could they have been curring?

Interro-negative form

Simple form	V-ing form
could I not curr? could you not curr? could he not curr? could we not curr? could you not curr? could they not curr?	could I not be curring? could you not be curring? could he not be curring? could we not be curring? could you not be curring? could they not be curring?
Perfect	V-ing perfect
could I not have curred? could you not have curred? could he not have curred? could we not have curred? could you not have curred? could they not have curred?	could I not have been curring? could you not have been curring? could he not have been curring? could we not have been curring? could you not have been curring? could they not have been curring?