English verb conjugation
COULD CONCOCT

Regular verb: concoct - concocted - concocted

Affirmation

Simple form	V-ing form
I could concoct you could concoct he could concoct we could concoct you could concoct they could concoct	I could be concocting you could be concocting he could be concocting we could be concocting you could be concocting they could be concocting
Perfect	V-ing perfect
I could have concocted you could have concocted he could have concocted we could have concocted you could have concocted they could have concocted	I could have been concocting you could have been concocting he could have been concocting we could have been concocting you could have been concocting they could have been concocting

Negation

Simple form	V-ing form
I could not concoct you could not concoct he could not concoct we could not concoct you could not concoct they could not concoct	I could not be concocting you could not be concocting he could not be concocting we could not be concocting you could not be concocting they could not be concocting
Perfect	V-ing perfect
I could not have concocted you could not have concocted he could not have concocted we could not have concocted you could not have concocted they could not have concocted	I could not have been concocting you could not have been concocting he could not have been concocting we could not have been concocting you could not have been concocting they could not have been concocting

Interrogative form

Simple form	V-ing form
could I concoct? could you concoct? could he concoct? could we concoct? could you concoct? could they concoct?	could I be concocting? could you be concocting? could he be concocting? could we be concocting? could you be concocting? could they be concocting?
Perfect	V-ing perfect
could I have concocted? could you have concocted? could he have concocted? could we have concocted? could you have concocted? could they have concocted?	could I have been concocting? could you have been concocting? could he have been concocting? could we have been concocting? could you have been concocting? could they have been concocting?

Interro-negative form

Simple form	V-ing form
could I not concoct? could you not concoct? could he not concoct? could we not concoct? could you not concoct? could they not concoct?	could I not be concocting? could you not be concocting? could he not be concocting? could we not be concocting? could you not be concocting? could they not be concocting?
Perfect	V-ing perfect
could I not have concocted? could you not have concocted? could he not have concocted? could we not have concocted? could you not have concocted? could they not have concocted?	could I not have been concocting? could you not have been concocting? could he not have been concocting? could we not have been concocting? could you not have been concocting? could they not have been concocting?