English verb conjugation
COULD CONK

Regular verb: conk - conked - conked

Affirmation

Simple form	V-ing form
I could conk you could conk he could conk we could conk you could conk they could conk	I could be conking you could be conking he could be conking we could be conking you could be conking they could be conking
Perfect	V-ing perfect
I could have conked you could have conked he could have conked we could have conked you could have conked they could have conked	I could have been conking you could have been conking he could have been conking we could have been conking you could have been conking they could have been conking

Negation

Simple form	V-ing form
I could not conk you could not conk he could not conk we could not conk you could not conk they could not conk	I could not be conking you could not be conking he could not be conking we could not be conking you could not be conking they could not be conking
Perfect	V-ing perfect
I could not have conked you could not have conked he could not have conked we could not have conked you could not have conked they could not have conked	I could not have been conking you could not have been conking he could not have been conking we could not have been conking you could not have been conking they could not have been conking

Interrogative form

Simple form	V-ing form
could I conk? could you conk? could he conk? could we conk? could you conk? could they conk?	could I be conking? could you be conking? could he be conking? could we be conking? could you be conking? could they be conking?
Perfect	V-ing perfect
could I have conked? could you have conked? could he have conked? could we have conked? could you have conked? could they have conked?	could I have been conking? could you have been conking? could he have been conking? could we have been conking? could you have been conking? could they have been conking?

Interro-negative form

Simple form	V-ing form
could I not conk? could you not conk? could he not conk? could we not conk? could you not conk? could they not conk?	could I not be conking? could you not be conking? could he not be conking? could we not be conking? could you not be conking? could they not be conking?
Perfect	V-ing perfect
could I not have conked? could you not have conked? could he not have conked? could we not have conked? could you not have conked? could they not have conked?	could I not have been conking? could you not have been conking? could he not have been conking? could we not have been conking? could you not have been conking? could they not have been conking?