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 couldn't demark you couldn't demark he couldn't demark we couldn't demark you couldn't demark they couldn't demark	I couldn't be demarking you couldn't be demarking he couldn't be demarking we couldn't be demarking you couldn't be demarking they couldn't be demarking
Perfect	V-ing perfect
I couldn't have demarked you couldn't have demarked he couldn't have demarked we couldn't have demarked you couldn't have demarked they couldn't have demarked	I couldn't have been demarking you couldn't have been demarking he couldn't have been demarking we couldn't have been demarking you couldn't have been demarking they couldn't 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
couldn't I demark? couldn't you demark? couldn't he demark? couldn't we demark? couldn't you demark? couldn't they demark?	couldn't I be demarking? couldn't you be demarking? couldn't he be demarking? couldn't we be demarking? couldn't you be demarking? couldn't they be demarking?
Perfect	V-ing perfect
couldn't I have demarked? couldn't you have demarked? couldn't he have demarked? couldn't we have demarked? couldn't you have demarked? couldn't they have demarked?	couldn't I have been demarking? couldn't you have been demarking? couldn't he have been demarking? couldn't we have been demarking? couldn't you have been demarking? couldn't they have been demarking?