English verb conjugation
COULD DEMARK

Regular verb: demark - demarked - demarked

Affirmation

Simple form	V-ing form
I could demark you could demark he could demark we could demark you could demark they could demark	I could be demarking you could be demarking he could be demarking we could be demarking you could be demarking they could be demarking
Perfect	V-ing perfect
I could have demarked you could have demarked he could have demarked we could have demarked you could have demarked they could have demarked	I could have been demarking you could have been demarking he could have been demarking we could have been demarking you could have been demarking they could have been demarking

Negation

Simple form	V-ing form
I could not demark you could not demark he could not demark we could not demark you could not demark they could not demark	I could not be demarking you could not be demarking he could not be demarking we could not be demarking you could not be demarking they could not be demarking
Perfect	V-ing perfect
I could not have demarked you could not have demarked he could not have demarked we could not have demarked you could not have demarked they could not have demarked	I could not have been demarking you could not have been demarking he could not have been demarking we could not have been demarking you could not have been demarking they could not have been demarking

Interrogative form

Simple form	V-ing form
could I demark? could you demark? could he demark? could we demark? could you demark? could they demark?	could I be demarking? could you be demarking? could he be demarking? could we be demarking? could you be demarking? could they be demarking?
Perfect	V-ing perfect
could I have demarked? could you have demarked? could he have demarked? could we have demarked? could you have demarked? could they have demarked?	could I have been demarking? could you have been demarking? could he have been demarking? could we have been demarking? could you have been demarking? could they have been demarking?

Interro-negative form

Simple form	V-ing form
could I not demark? could you not demark? could he not demark? could we not demark? could you not demark? could they not demark?	could I not be demarking? could you not be demarking? could he not be demarking? could we not be demarking? could you not be demarking? could they not be demarking?
Perfect	V-ing perfect
could I not have demarked? could you not have demarked? could he not have demarked? could we not have demarked? could you not have demarked? could they not have demarked?	could I not have been demarking? could you not have been demarking? could he not have been demarking? could we not have been demarking? could you not have been demarking? could they not have been demarking?