English verb conjugation
COULD GROK

Regular verb: grok - groked - groked

Affirmation

Simple form	V-ing form
I could grok you could grok she could grok we could grok you could grok they could grok	I could be groking you could be groking she could be groking we could be groking you could be groking they could be groking
Perfect	V-ing perfect
I could have groked you could have groked she could have groked we could have groked you could have groked they could have groked	I could have been groking you could have been groking she could have been groking we could have been groking you could have been groking they could have been groking

Negation

Simple form	V-ing form
I could not grok you could not grok she could not grok we could not grok you could not grok they could not grok	I could not be groking you could not be groking she could not be groking we could not be groking you could not be groking they could not be groking
Perfect	V-ing perfect
I could not have groked you could not have groked she could not have groked we could not have groked you could not have groked they could not have groked	I could not have been groking you could not have been groking she could not have been groking we could not have been groking you could not have been groking they could not have been groking

Interrogative form

Simple form	V-ing form
could I grok? could you grok? could she grok? could we grok? could you grok? could they grok?	could I be groking? could you be groking? could she be groking? could we be groking? could you be groking? could they be groking?
Perfect	V-ing perfect
could I have groked? could you have groked? could she have groked? could we have groked? could you have groked? could they have groked?	could I have been groking? could you have been groking? could she have been groking? could we have been groking? could you have been groking? could they have been groking?

Interro-negative form

Simple form	V-ing form
could I not grok? could you not grok? could she not grok? could we not grok? could you not grok? could they not grok?	could I not be groking? could you not be groking? could she not be groking? could we not be groking? could you not be groking? could they not be groking?
Perfect	V-ing perfect
could I not have groked? could you not have groked? could she not have groked? could we not have groked? could you not have groked? could they not have groked?	could I not have been groking? could you not have been groking? could she not have been groking? could we not have been groking? could you not have been groking? could they not have been groking?