English verb conjugation
COULD OK

Regular verb: ok - oked - oked

Affirmation

Simple form	V-ing form
I could ok you could ok he could ok we could ok you could ok they could ok	I could be oking you could be oking he could be oking we could be oking you could be oking they could be oking
Perfect	V-ing perfect
I could have oked you could have oked he could have oked we could have oked you could have oked they could have oked	I could have been oking you could have been oking he could have been oking we could have been oking you could have been oking they could have been oking

Negation

Simple form	V-ing form
I couldn't ok you couldn't ok he couldn't ok we couldn't ok you couldn't ok they couldn't ok	I couldn't be oking you couldn't be oking he couldn't be oking we couldn't be oking you couldn't be oking they couldn't be oking
Perfect	V-ing perfect
I couldn't have oked you couldn't have oked he couldn't have oked we couldn't have oked you couldn't have oked they couldn't have oked	I couldn't have been oking you couldn't have been oking he couldn't have been oking we couldn't have been oking you couldn't have been oking they couldn't have been oking

Interrogative form

Simple form	V-ing form
could I ok? could you ok? could he ok? could we ok? could you ok? could they ok?	could I be oking? could you be oking? could he be oking? could we be oking? could you be oking? could they be oking?
Perfect	V-ing perfect
could I have oked? could you have oked? could he have oked? could we have oked? could you have oked? could they have oked?	could I have been oking? could you have been oking? could he have been oking? could we have been oking? could you have been oking? could they have been oking?

Interro-negative form

Simple form	V-ing form
couldn't I ok? couldn't you ok? couldn't he ok? couldn't we ok? couldn't you ok? couldn't they ok?	couldn't I be oking? couldn't you be oking? couldn't he be oking? couldn't we be oking? couldn't you be oking? couldn't they be oking?
Perfect	V-ing perfect
couldn't I have oked? couldn't you have oked? couldn't he have oked? couldn't we have oked? couldn't you have oked? couldn't they have oked?	couldn't I have been oking? couldn't you have been oking? couldn't he have been oking? couldn't we have been oking? couldn't you have been oking? couldn't they have been oking?