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 couldn't conk you couldn't conk he couldn't conk we couldn't conk you couldn't conk they couldn't conk	I couldn't be conking you couldn't be conking he couldn't be conking we couldn't be conking you couldn't be conking they couldn't be conking
Perfect	V-ing perfect
I couldn't have conked you couldn't have conked he couldn't have conked we couldn't have conked you couldn't have conked they couldn't have conked	I couldn't have been conking you couldn't have been conking he couldn't have been conking we couldn't have been conking you couldn't have been conking they couldn't 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
couldn't I conk? couldn't you conk? couldn't he conk? couldn't we conk? couldn't you conk? couldn't they conk?	couldn't I be conking? couldn't you be conking? couldn't he be conking? couldn't we be conking? couldn't you be conking? couldn't they be conking?
Perfect	V-ing perfect
couldn't I have conked? couldn't you have conked? couldn't he have conked? couldn't we have conked? couldn't you have conked? couldn't they have conked?	couldn't I have been conking? couldn't you have been conking? couldn't he have been conking? couldn't we have been conking? couldn't you have been conking? couldn't they have been conking?