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 couldn't curr you couldn't curr he couldn't curr we couldn't curr you couldn't curr they couldn't curr	I couldn't be curring you couldn't be curring he couldn't be curring we couldn't be curring you couldn't be curring they couldn't be curring
Perfect	V-ing perfect
I couldn't have curred you couldn't have curred he couldn't have curred we couldn't have curred you couldn't have curred they couldn't have curred	I couldn't have been curring you couldn't have been curring he couldn't have been curring we couldn't have been curring you couldn't have been curring they couldn't 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
couldn't I curr? couldn't you curr? couldn't he curr? couldn't we curr? couldn't you curr? couldn't they curr?	couldn't I be curring? couldn't you be curring? couldn't he be curring? couldn't we be curring? couldn't you be curring? couldn't they be curring?
Perfect	V-ing perfect
couldn't I have curred? couldn't you have curred? couldn't he have curred? couldn't we have curred? couldn't you have curred? couldn't they have curred?	couldn't I have been curring? couldn't you have been curring? couldn't he have been curring? couldn't we have been curring? couldn't you have been curring? couldn't they have been curring?