English verb conjugation
COULD CLONK

Regular verb: clonk - clonked - clonked

Affirmation

Simple form	V-ing form
I could clonk you could clonk he could clonk we could clonk you could clonk they could clonk	I could be clonking you could be clonking he could be clonking we could be clonking you could be clonking they could be clonking
Perfect	V-ing perfect
I could have clonked you could have clonked he could have clonked we could have clonked you could have clonked they could have clonked	I could have been clonking you could have been clonking he could have been clonking we could have been clonking you could have been clonking they could have been clonking

Negation

Simple form	V-ing form
I couldn't clonk you couldn't clonk he couldn't clonk we couldn't clonk you couldn't clonk they couldn't clonk	I couldn't be clonking you couldn't be clonking he couldn't be clonking we couldn't be clonking you couldn't be clonking they couldn't be clonking
Perfect	V-ing perfect
I couldn't have clonked you couldn't have clonked he couldn't have clonked we couldn't have clonked you couldn't have clonked they couldn't have clonked	I couldn't have been clonking you couldn't have been clonking he couldn't have been clonking we couldn't have been clonking you couldn't have been clonking they couldn't have been clonking

Interrogative form

Simple form	V-ing form
could I clonk? could you clonk? could he clonk? could we clonk? could you clonk? could they clonk?	could I be clonking? could you be clonking? could he be clonking? could we be clonking? could you be clonking? could they be clonking?
Perfect	V-ing perfect
could I have clonked? could you have clonked? could he have clonked? could we have clonked? could you have clonked? could they have clonked?	could I have been clonking? could you have been clonking? could he have been clonking? could we have been clonking? could you have been clonking? could they have been clonking?

Interro-negative form

Simple form	V-ing form
couldn't I clonk? couldn't you clonk? couldn't he clonk? couldn't we clonk? couldn't you clonk? couldn't they clonk?	couldn't I be clonking? couldn't you be clonking? couldn't he be clonking? couldn't we be clonking? couldn't you be clonking? couldn't they be clonking?
Perfect	V-ing perfect
couldn't I have clonked? couldn't you have clonked? couldn't he have clonked? couldn't we have clonked? couldn't you have clonked? couldn't they have clonked?	couldn't I have been clonking? couldn't you have been clonking? couldn't he have been clonking? couldn't we have been clonking? couldn't you have been clonking? couldn't they have been clonking?